But going open source so that I know "for sure" no telemetry is being sent and charging for support would be the only way to get money out of me for this. I'm probably the odd one out for this, so take that with a fair helping of salt.
This is a great idea, so much so that this is also something I could probably put together a MVP of in a weekend (or two) of dedicated work (the fancy features that I personally don't care about would probably take longer to implement, of course...).
Good work! Keep it up.