Stan, thanks for getting me off the the hook with that diagram. My brain was starting to hurt, and I was losing sleep. I knew it could be done. That latching relay really makes it look simple. Well worth a few extra bucks to do it that way. I had all the pieces of the puzzle.
Richard, yes, leave the insulating pins in the switch. Taking them out would cause the points to lock in one way or vibrate back and forth. Both bad. The switch in this application won't use the anti-derailing feature. The relay is doing the throwing, but they still need to be there.