Hello,
Amateur astronomer here, and I just want to say thank you!
Traditional Nasa projects are insanely expensive (10B for JWST for example).
But others have managed to do much more with much less. The European Extermely Large Telescope (39m) will tick at around 1 billon (only)...
With Starship (wouch could have taken up the JWST withotu having it folded!) it would be darn easy to send a Hubble class telescope (2.5m) in space. And Making 2.5m mirrors this days is a peice of cake (way under the million mark)...
So, yes, I have no doubt that 500 millons can found 4 télescopes, including one in space (especially if they use common design).
While you are at it, would it be possible for someone to convince Musk to put a couple of smaller telescope (like a 20 or 25cm class) in some starlink? Something that amateur astronomer could rent for picture time? This is something that is already done on Earh, but It would be awsome to be able to take pictures from "up there"!
Cyrille