Most canned food has lots of salt in it. That’s bad for lots of us in normal times, but good for survival situations.
Yes.
Just like in a SHTF situation fat will not be a bad thing.
If salt is a concern you can always rinse it out. I have desalted ham & bacon in water. Taste was still good. Same with some canned vegetables. I use canned vegetables in a dish as salt equivalent sometimes. Same when adding cheese.
I have desalted the aged parmasan cheese I made just as a test. Parmasan cheese was a staple for some European armies in the field because of its compact, long storage and high nutrient value.
If water is scare you can reuse the salted water in other dishes where you would want to add salt.
Fresh vegetable trim (dry onion skin, stem ends of carrots etc go in the mulch now but go in the stew when times are tough.