My first thought when i saw this: TFP Ben 10

Given how this 👇 is Ben's canonical car:

You aren't too far off lmao (mostly on the colour at least).

You might not be particularly a fan of CNA from your sphere of headcanons, but considering that Ben can access another biomechanical species in the galvanic mechamorph, I'm sure there's enough of an Omnitrix work around to sample cybertronian data. Seeing as it's a Camaro you could probably have a TFP x Ben 10 crossover equivalent to TFA Waspinator maybe, a green Bumblebee (or a green hornet if you of/remember that) but it's Ben. Considering how the biomechanical Upgrade has a few biological translation issues to the point of not quite technically being a fully integrated transformation, maybe Ben would speak with his own voice like Upgrade does or maybe even through radio depending on how physically different cybertronians are to human anatomy.

I mean that specific line of thinking would only be possible if Ben snagged a sample of Bumblebee's CNA (or whatever you'd prefer) which could either be convoluted or unclimactic, though I guess if street racing in some part of the globe with a desert (aka somewhat nearby Bellwood which already exists cross universe between Ben 10 and Generator Rex) there could be some plot about his shenaniganery nearly running Team Ben off the road and messing with Kevin's own heavily modified yet fresh from 1979 Dodge Challenger to the irritation and anger of Kevin himself. Something something Bee got the attention of the wrong (mostly) humans(ish).