#1
looking for a combination Rotary Switch AND Potentiometer... ever seen one?

I've checked all the regular parts sites and cannot find what I'm looking for. I've seen the concentric and dual control pots in several places, but have not yet found a control that encompasses a rotary switch along with a pot.
PRS SE Santana - Santana III Bass/Treble
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#2
Haven't seen one, but some old oscilloscopes used something similar so they may have made such a thing in the past. Mouser will have them if they're still made, otherwise eBay if they're out of production.
Odds are not good that there's ever been something like that fit for guitar, though. Even if you found one you'd likely have to modify it.