Alright, I re-did the map as a COOP.
I've playtested it, and it's really tough for a single player (even one that knows where the bad guys are). But it should be a challenge for a small group, or pretty easy for a group that coordinates attacks and uses support roles like engineer and medic.
I kept the extra forward bases Hotel and Golf, but there is a time-delayed trigger that causes the Rebels to sabotage those locations, so establish a foothold on the island.
They are bad guys, so expect some nasty surprises.