If I ever get my knob key out, I'll check it for bends, and lube it up real good...but honestly, I can't see it ever coming loose at this point. I mean, that rascal is REALLY stuck. So, I guess I'll just forever leave it in the switch, and buy me some spares on which to epoxy some caps. Then leave 'em in the bags and seat locks.
I also have two cars with fob systems, but they both also require keys. Fobs are an unnecessary complication, IMHO. Guess they said the same thing about keys when ignition keys were first introduced way back when.