Classics Omnibots?

Okay, I started repainting Classics Prowl red, with a new head, originally intending on making an original character... when I realized that the color scheme I had chosen for the robot parts, with a little modification, would work well as "Universe Classics Overdrive". I'll get pics later when I get a new camera.
Meanwhile, that got me to thinking... who would be best as the other two Omnibots?
I was thinking Cybertron Red Alert (or either of the repaints) as Camshaft, to keep the whole "Robot chest is passenger compartment, but upright" bit... but for Downshift, the most obvious would be Classics Universe Sunstreaker. And I don't want to use Sunstreaker for that, as there's already going to be a mostly white version of that mold (Red Alert).
Any other suggestions for a "Classics Downshift"?
Meanwhile, that got me to thinking... who would be best as the other two Omnibots?
I was thinking Cybertron Red Alert (or either of the repaints) as Camshaft, to keep the whole "Robot chest is passenger compartment, but upright" bit... but for Downshift, the most obvious would be Classics Universe Sunstreaker. And I don't want to use Sunstreaker for that, as there's already going to be a mostly white version of that mold (Red Alert).
Any other suggestions for a "Classics Downshift"?