I think I will go with placing buildings, 2 to be exact, the sentry, and the dispenser. (This is just an edited your idea btw) He can place sentries in the halls, which shoot slowly and cant die (for technical reasons) but they get removed if he dies. Dispensers give him a very small amount of health regen (Because that's enemy medic's thing) but boost his firerate briefly upon entering a hallway (to avoid his boost just dont enter the hallway immediately.) When I wrote the previous comments I forgot I actually did know a way to add buildings sry for the mistake!
I dont know if his rework will be a part of the next update since this one is already quite ambitious but ill try to squeeze in the red engi rework! Any other feedback is much appreciated!
To do with the intel task.. Ill make it 3 times slower before 6 am, otherwise it would just be extending the night. so if players have a period of time free, they can make the night a little shorter.