>>398154740
>>398154356
>>398155041
>>398155337

avatars without hands = dead simple
avatars where feet are controlled by irl feet = dead simple if you buy trackers
avatars that use irl feet for everything, including controls and interaction = almost impossible

basically you can pretend to be a cripple and set up an avatar where nobody can see your hands, but irl you will still need to hold the vr motion controllers because they've got your thumbsticks for movement and vrchat itself expects those controllers for hitting menu buttons and stuff. 

Only other things I can think of is vrchat does support one-handed controller mode for people who are disabled and also supports generic gamepads for the rare people who have ancient headsets that didn't come with controllers like the first oculus rift iterations. So you could maybe rig together something like a DDR mat for movement via feet and so on if steam recognizes it as a gamepad. That sounds like an engineer problem.

tl;dr the avatar part is easy, seen a few rins running around in my time here. The specific limitations you want to apply to yourself are very hard.