This is C&V in the sense that it can extend the usage of your parts bin, and the Shimergo topic has been discussed here before...

As part of migrating my 2013 Super Record group to a most non-C&V frame, I sprang for the latest Potenza group for my KOF custom steel bike. Knowing that Campy changed the shift ratio for their SR through Potenza level stuff starting in 2015, and not finding much on the interweb about possible new mix and matching options...

My stand tests show that using a Potenza RD with 10 speed Veloce controls shifts through a Shimano 10s cassette flawlessly. Looks like older 11s Athena brifters should be able to use a Potenza RD to shift perfectly across a Shimano 11 speed cassette also (will test that when I get the Potenza brifters on my KOF frame). The shift ratio of the new campy RD is around 1.43 whereas the 8 speed era Campy was 1.42 (close enough for some interesting possibilities there also).

My calculations also indicate that the cable pull of Potenza 11s brifters is nearly identical to Shimano 11 brifters (2.7mm per click). This should allow you to swap in cheaper and lighter "new" Campy 11 brifters into an otherwise Shimano 11s drivetrain. Good news since the campy hoods are nicer imo and I prefer campy thumb controls for going to smaller cassette cogs.

Just some findings from my subterranean bike appreciation zone.