The only problem i have with this suggestion is that it only take under concideration people who either like curent system, or want it even more strict ... but completely forgets about people who want it even more loose.
I was thinking about merchants to solve this.
If they sell only a few supply bags and tons of food the "core" system suggested is safe and players can buy food to rest if they're playing with the optional "food=supply" rules ON.
I understand where thats coming from ...
But you switch the one problem with another, possibly even worse.

I mean if right now someome is bothered by "need to run around and gather food" ...
I would bet they will be at least just the same bothered (probably even more, especialy since game start) by "need to run around and gather food, or buy food by merchants" :-/
But the idea of repositioning and redistribuing the supply packs i really like and support. ^_^