Rewiring the RL-1 socket is not something I want to do; but the Potter & Brumfield relay is so tantalizingly close to what the FT-101 uses...
Luckily for me, my OM likes to make electronic gadgets and was looking for a new project. We wondered if he could make an adapter that would map the P&B relay pins to the existing socket connectors. He finished it yesterday and it works great. The adapter comprises a socket for the new relay to plug into, two stacked circuit boards that do the remapping, and homemade brass pins that plug into the old socket. The pins were actually one of the tougher problems because he couldn't find any ready-made pins that would fit. We'll keep an eye out for corrosion on those brass pins. Those shiny new relay contacts snapping back and forth make me so happy.