I don't think I'd want a semi-auto as my survival gun. For the past 50 years I've think I've tried just about every .22 rifle out there. Remington 552 speedmasters, 10/22's, Marlin model 60's, nylon 66's. I just wish my latest was around back then, the CZ scout.
A bolt action will give a more realiable, simpler gun under harsh conditions. The Chipmonk like in the photo, or a Henry mini-bolt, or a CZ scout gives a small light weight gun easy to carry, very accurite, and few moving parts.
The problem with combo guns is that you have to carry an extra barrel unless you have a Savage 24, then you have a heavy gun. In a survival situation you may be injured, or allready burdened with supplies, so weapon weight counts, as does ammo weight.
The couple guys I knew in the service who were from WAAAY back in the hills of Kentucky or West Virginia, swore by a bolt action .22 if they had to keep their family fed. In fact i recall from Audie murphy's biography, growing up dirt poor in rural Texas, it's what he used. Theres always more small game around than big game. You can go a long way on squirrel stew or roast rabbit.