The only US G1 MPs that I can think that Takara's ever done are:
* the limited exclusive variant of MP Grimlock (with the Marvel US colours and crown).
* MP G2 Sideswipe - the face sculpt and accessories based on the G2 US comics.
But these are both variants of already existing MPs that they made. I cannot think of a single new-mould MP that Takara have ever made based on a US G1 character that was never released in Japan.

The closest that's ever been done would be MP Offshoot, but that was technically done by Hasbro as an accessory for their version of MP Rodimus Prime. Otherwise all MPs are based on what is essentially what has been released in Japan.