I don't have any info but I'm very interested in this. I was just about to try a Suhr type passive dummy coil because my friend (a gifted luthier) is interested in noiseless stuff; however I hate the idea of routing a strat like.
The Fender Elite looks like a fantastic idea.
After seeing that, here's what I'm gonna try: simple TL072 buffer after dummy coil, same thing at the normal output point of guitar circuit, combine. Switch in an additional dummy coil in parallel with the first one in positions 2&4. Assumptions: swimming pool route, 4-pole switch, unity gain all around.