Don't take this the wrong way but have you considered using a different stack? I know rust is cool and everything but it's far from the industry standard for game dev.
Honestly I would really consider using Godot since it's not only going to handle a lot more "game engine" stuff, it will also let you lean on the existing tools made by the community and probably increase your chances of getting direct help as well.
No reason that rust can't be a good Lang for game dev but as you mentioned, the whole ecosystem is a bit immature in terms of game dev.
I honestly can't imagine using Blender without hotkeys. This is really cool and I'm sure it will be great for the project but a full touch based UI sounds like a nightmare.
I suppose this will support physical keyboards.