I think you should keep the 452, which I prefer over the 455/457 with ?screwed on? barrel ... but that?s just me. After all, you children / grandchildren will thank you some day in the future for keeping the 452.
My eyes are old too, I scope every rifles I have. For those CZ models that have a rear sight, it will either limit the length of your scope, or, require higher scope rings to clear the sight ... how high the rings you need depends on the size of the Objective. I do not have UL but do have a Trainer, have played with different options, as well as scope+rings combination.
I have tried removing the rear site to accommodate a 44mm objectives (it was a 18x Mueller scope, IIRC), and I have tried a shorter / smaller scope (a Leupold 3-9x 33mm EFR) with the rear sight in place.
You would need to, first, decide which scope do you want... eg Vortex, Nikon has big arse eye box that will limit you to use low rings.. but you can add some weaver adapter to the dovetail to gain height for clearance...
If for paper punching / bench shooting for accuracy, you would want some higher power scope , like 16x or 18x .. or even more. For plinking/ hunting .. folks tend to stay within 2-7 or 3-9 ,,, and anything in between. As always, our budget will limit what we end up with.
Personally I think the new Leupold Freedom series has very value.. glass is better than the old VX-2 series. I also find that Weaver Grand Slam series has very good optics, Natchez.com has Weaver scopes on sales from time to time, be sure to check them out, sometimes their sales price is better than buying a used one.
On cheek weld, I use stock packs, I like those from Eagle Industries. I can put additional foam underneath it as well. Triad Tactical stock packs come with additional inserts.
You are correct on barrel length, longer barrel tends to help velocity... people tends to believe that for 22LR, ?optimal? lengths is within 16? - 18? (IIRC), the shorter the more rigid, the less harmonic effect. But then... CZ 452 American and FS is 22? but they are (mostly) known to be more accurate.
Accuracy varies from rifle to rifle, and also depends on the right dose of ammo.
Most time... I learned from mistakes ... but that?s the fun part. LOL

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