I'm going to make an app in godot that will only rename the bones of a rig system created with Vroid, rigify, mixamo, autorig pro and a couple of other autorigging plugins.

And sell it for 5 usd.
I think that's something that would be 100% useful and what I would actually pay for.

Because it's a pain in the ass to do that by hand and it would really be super cool if I didn't have to mess around with blender addons and it would really be cool if it was just a button and that's it.

It's literally something I would pay for an app that would convert from rigify to Vroid or make everything super comfortable and easy.