Clutch fan possible?

you can adapt a Mercedes fan clutch if you need some clearance as they are pancake thin. Ie. use the whole thing.

PS>> I saw a belt drive fan in a shroud that was very thin. It had a motor up at the corner Moroso water pump style, and a belt that ran diagonally down to an internal fan in the shroud. It looked like he had about 3" between the water pump pulley and the shroud. Sort of like a swamp cooler looking rig but it was tastefully done.