So is there an off the shelf aftermarket solution for this or would I be looking at OEM retro fit?  

 

I could have a complete donor available for this swap, but the donor car has x2+ the mileage and I'd prefer to keep the 'newer' front seats in the original car.

 

Alternatively I guess I could source a newer similar mileage set of heated seats?????

 

Cheers

It’s much easier to use donor seats with heaters already in, then wiring loom from Kufatec (reversed from the instructions as they are for LHD) and climate panel with seat heat buttons and code.