We regularly do sub-100 point tournaments with 12 asteroids/debris. Deployment rules are to keep them out of the player deployment zone, and then range 1 away from each other. It can get to be pretty close to a regular asteroid deployment if one person puts their 6 on the edges, and the regular 6 in the middle. It normally makes flying a lot more fun, I recommend everyone try it if they can!
Come to think of it, we should try this at 100 points and see what goes on...