I think I'm going to go with the solid state setup. Before I buy more parts I don't need, do these look about right to y'all?
Flasher
https://www.eriksmilitarysurplus.com/tusiflcoun11.html
Connector
https://www.eriksmilitarysurplus.com/comsfortusis.html
Switch
https://www.eriksmilitarysurplus.com/tusiswm3m8et.html