Have it be a normal ass round, but every xeno is replaced by a random CLF fighter sprite, but have all the normal xeno abilities.
Finally a unique event idea!
And make the CLF survivors have xeno sprites but they can still hold a gun
Like, mechanicly it would litterary be no different from a normal round. Only sprites would be changed.
I leave it to admins to make a very fucked up CLF to be on ovi.