I don't see any problem with any of this.
As with all loaned tools, you can, of course, retain ownership and control.
As it's your tool, rather than the space, I don't see any way at all that anyone could say the space is supporting your business. We all know you've got space and juice to run it, so even that argument would be moot.
The benefit of having it at the space would be awesome.
In the interest of it being usable by all, including broke ass me, I'd be interested in having the org pay whatever kind of fee you're talking about, rather than individuals feeding a kitty. (no idea how you saw that working one way or the other)
Just so I can ponder, what's the cost of a replacement laser, what's the lifetime in hours on the current laser, and how much of the rep. cost were you hoping to recoup?
If we get numbers and time and percentage us vs. you paying for a new laser, the math should just kind of come together.
I'm really excited, there's a lot of stuff I could do with a laser cutter, and I'll do anything I can to help make this happen.