True, haha. But honestly, it's a good thing they try to iron out all bugs and things which don't work as intended. We should be patient.
As for json files, I think I'll organize extracted assets and release a pack with unpacked .bundle assets for a recent version. No idea how you plan to automate it, though. Bone size change in json file alone doesn't really cut it. It does require some manual edits via spine editor and since we don't have access to a cracked spine 4.0.3x-4.0.6x (if anyone know if there's a crack - feel free to post this info) it just doesn't seem possible for a proper community graphics mods.
Custom sprite drawings/redrawings of existing ones - I'll try to organize it eventually. I can give it a try to implement graphic changes as well, although I'm easily distracted with
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But again, please level your expectations about modding this game. No discouraging here, just saying.