I would like to offer a compromise of sorts. For a future achievement that awards a mount, I suggest to award everyone a Used Rocketstrider as a mount. It's a mechanostrider, but it flies using the two rockets at the bottoms of its feet!
(it already exists in one of the questlines in Loch Modan)
((I would have suggested a Flying War Elekk, but that mount would be just too silly...))