For a survival rifle, you don't
need a centerfire supersonic rifle cartridge, and I'd suggest either a 22lr or PCC might be the way to go (yes, both can be supersonic).
Easiest/most common options would be 10/22 takedown or charger, and then the 9mm Ruger PC Carbine/Charger (given unnecessarily heavy barrel of Carbine, I'd suggest the Charger -- you're a lawyer, so do your own analysis on risk on how the pistol brace BATF rules/proposed ban may play out in light of bumpstock ban being just overturned by the courts). Ruger's new LC Carbine is also intriguing for a compact survival option in 5.7x28 (I think the .22lr vs .17 hmr debate is analogous to 9mm vs fn5.7), especially if you have to have a 16" barrel.
And given Biden's Russian ammo import ban that's not yet fully realized (already approved imports still trickling in but no more permits being approved), I suspect we'll see 7.62x39 become more expensive than .300 BLK in the near future... .300 BLK does superb in short barrels making it ideal for a survival gun (again, contingent on pistol braces) and tends to have more ammo options, including factory-new subsonic loadings -- when subsonic, energy is roughly equivalent to .45 acp out of a PCC but w/ better ballistics and more penetration... But if you run 5.56/.223 be aware of cross chambering capability and kaboom risk.
That said, I'm in agreement the Vz58 is among the best CARBINES ever made, and perhaps the best post-WW2 to 2000 in its historical context. But it is a dated design with limitations -- for me and many here, those limitations aren't dealbreakers, but for some they may be.
For a more modern 7.62x39 platform with less of those limitations, I'd suggest a CMMG Banshee might perhaps be a viable alternative, especially for someone well versed in the AR platform. PSA also offers a version of this for lower cost.
And FWIW and in the historical context, I'd argue that post-WW2 to 2000, the Galil is also among the best if not the best semi-auto COMBAT RIFLE ever made. In .308, I'd argue the FAL is superior to the Galil despite SWAT Magazine's Chuck Taylor arguing otherwise (primarily due to the FAL being designed around .308 whereas the Galil really wasn't -- issues with receivers and bolts in high round count situations) -- and to that end, shorty .308 FALs might also be worthy of survival rifle consideration.
EDIT: Saw this chart posted a few days ago on a different blog -- 11" .308 is a FAL, and for 7.62x39 the 8.5" is a Galil ACE and 16" is a WASR:
Looks like this is the original source and notes " 11” DSA Para FAL OSW ", click through for full accounting:
https://masondixonsurvivalistassociation.wordpress.com/2023/01/06/a-comparison-of-cartridge-versus-energy-versus-barrel-length-versus-weight/ If speaking just to Armalite .308 RIFLES, they'd certainly be in contention but like Galil .308s are pretty much collector items -- and for the non-collector AR10 given so many variants, etc. issues, just isn't in contention for me as a battle rifle. And my interest in AR10s these days is pretty much exclusively for an accurized 6.5 Creedmoor platform, not a .308...
While I don't have any particular issues w/ the PTR91s other than their 500 round required break-in for reliability, I think they're analogous to the AK in the carbine space -- extra weight, stamped metal, somewhat unbalanced/unwieldy, no last shot bolt hold open, other inherent limitations, cheap mags, etc.
Post-2000, you're likely looking at the AR15 being best at both due to all the development/improvement/aftermarket parts/customization of that platform (be it 5.56, 6.5 Grendel, 6.8 SPC, .300 BLK, .224 Valkerie, .300 Ham'r, 6mm ARC, etc. caliber), love it or hate it (and including both piston and DI guns and variants, even though DI AR15s aren't true DI, technically an internal piston).
Lastly, be aware that there are single stack sporter VZ58s still in circulation. They're super-rare, but legal (at least as of 2020) in places like CT where many other semi-autos aren't.
However, given the left's changes in ban definitions to features, not names, and the features list growing (for instance, Biden has recently stated he wants to ban ALL semi-auto firearms be it shotgun, rimfire, pistol, centerfire rifle, etc.), I don't know that there's much value in neutering a Vz58 or any rifle for cross-state portability.
Instead, my suggestion would be to get a lever action in .357 magnum (can also shoot .38 special) for anywhere you aren't worried about grizzlies, and .44 magnum lever action (also shoot .44 special) for anywhere that you are concerned about grizzlies. AFAIK and haven't researched all state/jurisdiction's laws, they're about as gray as you can get and should be broadly legal -- and should be more reliable than a Ruger Mini rifle. Your call on carrying a revolver sharing the same caliber vs an automatic, but that's certainly an option.
Regarding history of Czech weapons, there's actually a dearth of English-language material on them.
Hognose of the Weaponsman blog (he passed away unexpectedly in early 2017) was starting the first book in his planned compendium of Czech weapons, eventually planned to include rifles and the Vz58 -- he was a Green Beret and Czech was at least one of his qualifying languages -- and all of which I was really looking forward to...
An archive of his site is here, but his first book was never published but was allegedly in a largely complete draft and was to be regarding handguns (largely or exclusively autoloaders given my recollection of the guns he was buying at auction for purposes of studying/photographing):
https://billstclair.com/weaponsman.com/So that said, there's a good Vz58 book on ebay which is a great place to start and about the closest I'm aware of for commercially available source material:
https://www.ebay.com/itm/294117045067And the forums here have a decent coverage of known info as well, but will require a fair bit of reading.
Lastly, welcome.