Jumper wire kit on sale now get them while they last.
This pretty much has to be done via the cell phone network.
So you’re right...
Back in the 70s I made some good money disabling the seat belt “no start” interlocks, which was super easy, just disconnecting a two wire harness under the seat.
My wife had a 1986 Jaguar XJ that had this feature. I’m not sure it was the feds, but someone was throwing the switch, regularly.