that sounds good, but it would be far more convenient and far easier just to port it over to mobile formats and allow users to use it as normal. obviously, this would only work for android devices because iphones are too limited to run something like utau, regardless of whether the processing is done on the phone or in a server.
i think my crazy product idea would be: an utau VST instrument. something similar to piapro studio but for utau. this would make it WAY easier to use an utau in original songs, and would make properly timing things in the ust far easier.
custom figma figures. it would be really cool to draw some character art and get it custom made as a figma.