Half a turn around a drum is not much for a UHWMPE tether (pulley). I think for serious power transmission more turns (eg serpent like running through wheels) or pinching wheels could be used. For the airborne part this is a challenge to put it mildly.
A reel or rather more turns on a single wheel has problems related to twisting the rope and the fact that the rope will be moving sideways on the reel. One could perhaps use this if the airborne and ground reels were twisting in sync, netting zero twist. This is more of a mechanical design question that I am not too competent to look at, but no doubt challenging