Stone and Sky
EDIT 2: Now you don't have to pretend
Probably easy to do with TR Megatron, just need a new faceplate for the titanmaster, remove the stickers, and maybe some black paint.I always thought they ought to redeco a Blitzwing mold as Leader-1; jet and robot mode decoed for the Gobot. Tank mode decoed for the Mini-con.
I have a second TR Megatron for exactly that. Not sure where the faceplate is, but I think I have one of those as well. Just need to get the time to actually work on some of these projects. One of these days...Probably easy to do with TR Megatron, just need a new faceplate for the titanmaster, remove the stickers, and maybe some black paint.
Leader-1 wouldn't end up looking like anything more then a either a silver/grey seeker, or thundercracker with a white chest. While you could retool the head and chest and maybe arms; he'd still have the seeker silhouette.