Maybe make it a hybrid between Survival and Outpost and call it "Siege" or "Holdout"
Make the areas you run to and spawn in extremely advantageous every so often, maybe having loose grenades or rockets here and there, or maybe a .50 mounted facing one of the roads.
HQ will tell you which safe house has not only been resupplied, but also reinforced, and a capture zone and resupply box will be present in that safe house. If the majority of the surviving team runs there and chooses it as their spawn, your teammates can respawn there every 45 seconds for 5 minutes, until the zone is contested & captured by enemies, or until another safe house is taken.
Hostiles will immediately default to trying to overrun that specific safe house Checkpoint Defense style, rather than searching the map or camping safe houses. This sort of "Holdout" can be used as a diversion so that other friendlies can sneak to the next safehouse, or it can be treated as a sort of "insurance" in case fire support is being called by the enemy, or you suspect a fair amount of your team is going to die again.
After the 5 minutes are up, HQ will inform everyone that "Nobody's left at X Objective, Move out!", or "They're sending something big, MOVE!". At 6 minutes, enemy fire support will target that objective. Typically chem gas and explosive drones on INS, and an A-10 or new fire support option, the TLAM-E on security, and that'll knock out and destroy any turrets or sandbags that were generated for that objective. Contrary to regular fire support, in this game mode, you CANNOT survive it if you are in the radius (Read as on the OBJ).
(General Traits of TLAM / Tomahawk: The Tomahawk takes about 30-45 seconds to hit point of impact from confirmation, and makes a very audible noise, similar to the rocket barrage. A commander has about 2 to work with, and is essentially treated like a single artillery shell with a much larger blast radius, and specifically an EXTREMELY HIGH wall penetration value. Surviving the TLAM requires moving down to lower floors or away from the front of buildings. It's designed as a bunker buster to get enemies off OBJ, similar to the IED drone, but while the IED drone can go inside,this can't.)
I figure this might add a little more depth to gameplay without making it a non-stop camp fest, or "just" running like a chicken with your head cut off.