The whole idea of a survival rifle is pretty romantic. In reality if you crash you're probably either too dead/maimed to use a rifle or just fine and the cavalry is already on the way, no need to for living off the land. This is more for day to day taking walks/fishing way out there in bear country when waiting for clients.
Edited to add: In a really rude landing the last thing you want is more hard objects in the cabin with you.
So would a mare leg takedown be of use in this situation. Add a piece to rear stock to make it full length. 3 pieces with longest 12”