A .22 isn’t in the same league as a center fire trainer rifle.. but, if you live in an area that isn’t the most conducive for getting out and shooting that often in field conditions, but a suppressed .22 w/ sub sonic ammo does..
I considered building a .223 trainer like everyone does here, but when I’m out in the mountains, I’d rather just shoot my 6 CM. So, I have a CZ 457 .22 that I can build positions and shoot literally every single day at my house. It’s a 250 yard gun that will still hone your fundamentals and help you understand what wind can do to a small projectile. Plus, it’s the most fun you can have with a gun! Hollywood quiet.
If you can put the same scope as your hunting rifle on the .22, or just the same reticle, that’s even better.