You can recover everything you need from the MPQ. You can even discover all the models (even ones not in your listfile) by doing some code/object analysis.
The issue is going to be the natives. 1.30+ introduced many new WC3 natives, like the ability to change attackspeed, armor, etc. though code alone. There is no easy replacement for some of these. If a 1.31 map uses these, you can migrate it by removing the natives but you're going to break features. Fixing those features will take a lot of work. Depending on how heavily the map uses these as features, you might be better off starting from scratch with the terrain and objects.
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