An interesting update.
I had an appt with my "old" neph today, wondering if this would be the last one. Turns out my "new" neph was a former associate of his. "New" had left the practice a few years ago for apparently some internal political reasons and "old" had been one of the few supporting her. When "new" left to start her own practice, "old" was a silent mentor and he said he still communicates with her frequently and considers her a personal friend and has her cell number on speed dial. (Consider that I'm in a large metro area with 40-50 nephrologists practicing in this region.)
So it looks like I might really be able to have two nephs willing to work together as a team as awkward as that may sound.