I've been building a lot of pedals lately and instead of boxing them all individually I've been using bigger enclosures and putting 3 in each. I wanted a way to switch the order since they are all hard wired inside and happened upon this old thread.
Anyway it got me thinking and I built this monster and it works, at least I get signal across all 6 positions and they sound different. Pardon my crayon drawing and my crappy wiring job but it was a real pain in the ass and I had to start over a couple times. It's also going to be a really tight fit. I'll probably buy another switch and do it from scratch now that I know it can be done and it is very cool but honestly I think just 2 toggle switches with one switching A and B and another that switches A+B and C would be way easier, just not as cool.