lol, I'm a lefty, so the charging handle is just perfect.
extended bolt release might be handy, as it's solely on the left side and my instinct is to hit it with my RIGHT hand thumb
Vz58 usa or whatever that new site is sells ambi mag releases that are fairly ideal for lefties. You can leave on or cut off the right side extension. Not aware of any issues with those releases (speaking to factory that makes them, not the US company).
As a lefty with the charging handle on support hand side, there's little need for a bolt release. The ones that vz58 usa sells -- I've had some from the same factory that had major issues w/ about 1/2 failing after the first couple range sessions. Issues with posts/rods breaking (at bolt carrier when trying to arrest, inside channel, etc) as well as rods coming unattached from finger extension portion (it was a puddle weld that connected them at the time, ~5 or 6 years ago). Could have been a bad batch. Could just be the product -- had roughly a dozen so decent sample size and might not have heard of all the problems.
You have to either hand fit from different vendors or run the bolt release and mag release from the same vendor. If cutting off right side mag release extension, then there's no reason a Zendl bolt release wouldn't work with the vz58 usa mag release.