Some kind of convoy attack/defend mission with 2 teams. There are actually two ways it could be done. The first is where the convoy is stationary and team A attacks them. The second is where the convoy is moving and has to get past a point in space that the attacking team is protecting "reach the jump point" as it were.
Scenario 1:
Team D
A convoy of unarmed transports is making a supply run throughout this sector and needs fighter cover. Defend them!
Team A
A convoy of military transports intends to deliver supplies to our enemies. Stop them!
Scenario 2:
Team A
A convoy of transports is making a run for the jump node. Don't let any make it!
Team D
A convoy of our transports is making a run for the blockade. Break the blockade for them!
The transports would be AI controlled, UNARMED and provided as props by staff (perhaps https://steamcommunity.com/sharedfiles/filedetails/?id=1978003281). The transports could have target zones such as jump drives, engines, reactors or cargo containers that if you hit them are worth points to the attacking team. The defending team would have to save a certain percentage of all points on the transports (perhaps 60%), gains points for each remaining objective block and would gain additional points for destroying Team A ships.
Fighters to be used by both teams could be provided by staff, with player made (and provided) ships screened for approval.