Introduce Solar Grand Melee winning condition.
Teams mutually agree and declares stalemate in game - (team(s) has drops or just don't want to suffer prolonged game because of belligerent afk'r or the like).
Each team chooses principal fleet(s) up to 1/2 of a players max fleet supply to assemble for showdown at Sun.
Wormholes connect to Sun, phase lanes are locked, and solar radiation timer starts 20 min countdown to Coronal Mass Ejections, followed by complete Nova in 10 more minutes.
Team with most fleet supply left standing or intact at time of Nova wins.
Then again, could just make Sins 2.