BrassMonkey: I had thought about doing that as a backup to the regular ignition also, and plan to implement that as a alternate solution.
A thought occurred to me after looking at the schematic again and remembering something I saw when installing the starter motor after having it rebuilt. On the starter motor there are two connectors. One large and the other small. The large connector contains two wires. The first being the battery cable and the other being about 5 wires which are crimped all into one connector. The schematic shows a wire going from the battery to a post on the light switch and another wire going from the same connector to the ignition switch. I have wiggled these (the 5 wires crimp connector) wires before and the ignition started working. This was shortly after I purchased the vehicle and re-crimped all these wires into a new lug. Since it appears that the ignition power going thru the ignition switch then thru the Neutral Safety switch originates at the battery terminal of the starter, there could be resistance built back up within those 5 crimped wires causing what appears to be a starter problem.