This is interesting. If you take Cog or one of his mold family, move the arms/guns to the sides in 'vehicle' mode, and flip up the middle pegs on both halves, you can get a Turbo Board Action Master partner that's at least as believable as Slicer's 'exo suit' with no kitbashing whatsoever. The pegs go right into the bottom of the feet, stabilizes the whole thing. And Origins Jazz has enough peg holes to use Cog's various weaponizer modes with him.
I'll be the first to admit this is lazy and cheap, and probably could be improved quite a bit, but for a whopping three minutes of work, I like the results.
Edit: Better pictures of what I'm talking about.
Edit to edit: No new pics but I.think Red Cog works better, simply because the colors DON'T match and I think Jazz would make his board flashy. I'm keeping this pairing for my own setup...