It most likely never has been converted as later XR3's were EFI, easiest way is to just get another switch from another model, dosen't neccessarily have to be yours!

Plenty of cars don't have cut outs not just non fords, for example classics but for safety it's best there is one, hence why it's there in the first place.

I think the relay is yellow, pink one is a relay with a timer and was fitted to the MFI cars and is expensive!

Martin