You've likely thought of it, but don't forget toggles for the "hidden" functions of the key switch such as fuel pump, ECU power, etc.
It's something I have intended to do and not gotten around to it. I also intend to replace the stock square switches, and think the easiest route for that is to make a plinth that covers and stands just a bit proud of the dash surface. Minimal rewiring required. Put an annoying beeper in your turn signal circuit--or replace the switch with a momentary one.
Randall