Kinda like the idea.
How about this:
2 Groups.
1. Group "The Attackers"
2. Group "The Escapers
"Escapers" have to race to a finish, maybe with 3-5 CP on the way. "Attackers" have a time limit to keep the "Escapers" away from the finish line (aka destroy them).
Maybe to complicated for AX mode, but I like the idea.