The Toyota belt tab won't fit and latch into the ford belt receptacle. So....either there are two receptacles on the seat or you sew a ford belt tab onto the Toyota belt.
There are companies on the internets that will sew belts all legal and safety like if you send them the whole belt assembly... how you choose to use them may throw a wrench into how that all plays out though.
Got it, (i think). So if I decide to use the Toyota belt and receptical 100% of the time, and ignore the Ford belt on the wall, I should be able to accomplish the above. (or, as you said, have 2 receivers).