My opinion: having more sticks coming out of the floor does not make you cooler. It just clogs up the floor.
Maybe it's just a Jeep thing, then.
I know of one other overdrive, the Borg Warner R-10. That bolts to the back of a Dana 18 or 20, so you might be able to make an adapter plate to mate it to the 205, or swap transfer cases. That's like an actual little two speed transmission that is electronically shifted with a govenor or mechanically shifted with a cable or possibly manually controlling the solenoid. They're not produced anymore, but there is a guy that sells refurbished units and tons of parts.
Joe