AZA Autowheel is probably the best custom steering wheel vendor out there - they have heated option for any/all of their wheels (incl. carbon fiber)
That's where I recently purchased my LED Display wheel with heated option. When I ordered the wheel I made sure to ask if the heated portion (wires) had the mating OEM connector attached for simple PnP & they stated yes - and it did
So AZA is a company that sells heated wheels WITH the OEM PnP connector