I don't want to nerd out on this too much and, like, come up with a Dungeons and Dragons rulebook-style answer to this problem, but we could do something like: if you make up to, like, $10,275, we could ask for 10% of that, and then if you make up to $41,775, we could ask for 12% of that extra money, and then up to, I don't know, $89,075, we could take ownership of maybe 22% of it, and if you're making a cool $170,050, 24%.

I know this seems a little fantastical and engineering-brain-y but it also means we don't have to spend much time thinking about how much of Obi-Wan Kenobi the state of Oklahoma owns; we can just settle the whole obligation back to society in dollars. I don't know, seems simple to me.