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