Conversely, if you wanted to use a spare 022 switch as the latching relay, it would be something like below.
Track voltage to spare 022. The left loop must always turn off the track power from spare 022. The right loop must always turn on the track power from the spare 022. The advantage of this is that you now have track voltage back to the isolated section. Again, you may need to experiment with actual wiring to opposite binding post. My diagram is more conceptual - I can't remember exactly how each binding post behaves when the switch is thrown.
However, with track power feeding the switch, you might have the problem of not enough power to throw the switch properly, so you would be back to needing a proper latching relay. I'm interested to hear how you proceed.
