Your first post got me thinking about this. Your solution is fine for the flipped switch but doesn't cover the case where the ingition swithc has been turned on for whatever reason. I have had people walk out of mine when the step has retracted and just catch themselves as the step was extending. I haven't done anything about it yet but you have me thinking.
p.s. Your picture trail is quite good. May I suggest that you upload it to this site? I say this because some information that I thought was quite valuable has been lost as websites and interests change.
2001 Winnebago Adventurer, 35U, W-20 8.1
F+R Trac bars, F+R sway bars, SafTsteer, F Sumo Springs, 4 Koni FSDs