I really want this controller but it uses a mini din connector instead of a 8-pin din like on the US console. https://www.risingstuff.com/store/engine-controller-blaster-p-2585.html
I assume you could make an adapter with a female 8-pin mini-DIN connector, some wire, and a male 8-pin DIN connector. If you were so inclined.
The cable inside the controller does typically disconnect cleanly. However, my preferred solution is to swap the cable on the tap. It's a reliable and fully reversible way to have an adapter that lets you use a pile of PC Engine controllers on a US-region Turbo unit.