Maybe this variant has been done before, but I haven't seen it floating around yet. As a house ruling in your games, how about dealing damage to both ships until the hp weaker ship is destroyed. So the more healthy ship takes damge equal to the remaining hull of the weaker ship. No more need to worry about collision rules, just worry about colliding!
(also prevents demo from recklessly flying into close range with engine techs without first considering the danger of collision)
Could encourage more careful/reckless flying, depending on ur playstyle. As rebs are generally weaker in hull it lends to their style of weaving and dodging while imps can choose to brute force their way through.
Edited by Muelmuel