Tawrich top is too high. Easiest way to get on top of that as an LA is to drop in or take the elevator up.
south indar is best for drifters in my experience, its north west indar that drifters can be a death trap. So much flat desert especially around indar excavation site. Usually when there is almost always a zerg there so dropping in from aircraft is incredibly risky.
I love people who do that. When I'm there I plant Claymores in the elevator shaft just to welcome you