I don't really care about game balance, this is purely for therian reasons.
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Replace food meter with battery charge indicator (purely a visual/textual change, probably could just be a resource pack)
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Let me activate my hard light feathers to fly (mechanically, a toggle-able elytra and the ability to flap my wings(mechanically identical to using a firework, except my hands have to be empty to do it) at the cost of 0.005 battery(food) exhaustion per game tick (effectively Hunger 1) while feathers are active and 0.2 battery exhaustion per flap (same as a jump while sprinting). Feathers will automatically disengage when battery drops below 6 (same as when sprinting is disabled))
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A bunch of stuff I already know is in other mods (custom player model, a GUI with mini map, compass, & time of day, etc.)