The PSL fire control group isn't quite the same as that of a standard AK. It's a bit larger. The only aftermarket trigger I know of is the Red Star Arms adjustable trigger. They have a version specifically for the PSL. However, I've never found a reason to want to change my FCG on my PSL. The trigger is fine. The thin barrel isn't really a drawback, in my opinion. It vents heat faster, and is fine for a practical rifle. If you're going to be hunting, you won't be firing that many rounds, either.
The Tapco FCG, even if it works in a PSL, is absolutely unsuited for use in a hunting or target rifle. I have one in my converted Saiga .223. If you perform a target pull on the trigger, the gun will bump fire every single time. I use my Saiga for hunting, so this is unacceptable. I'm now needing to install a muzzle brake on my Saiga to stop it from doing that. I would never recommend that FCG for this style of rifle.
I looked into the idea of plugging my 10-round PSL magazine for hunting. The PSL mag has a hole on the back to let you check ammo levels. A 10/32 screw with 2 nuts on it would plug the magazine to 4 rounds, or 5 if I modified my follower very slightly. Since 2 nuts make a screw non-removable from the screw head, it would satisfy the requirements of most states that the plug be unable to be removed without disassembling the magazine.