I saw your other post before this one. It's an even more special person who will take a senior with no teeth. Poor baby. From various rescues that I follow I've heard stories of boxers grinding their teeth down to nothing trying to chew off their restraints, and others needing to have teeth extracted due to no dental hygiene.
Whatever the reason this baby has for his situation, it sounds like he's in a good place now.
You could also try mushing up some salt-free canned peas. We pour them on our boys food often, but if they would be easy to mush up.
You may have already done it, but you could always use the blender to make some more things edible, even soft dog treats (maybe add a little water), and then store them as needed.