Updating this request from more than a month ago to let people know I'm still looking, and I've switched my focus to 64 cm as some of the group members have convinced me that's the better size for me. This bike would fill in some areas where my beloved AHH doesn't quite fit (e.g., running errands where I need to carry more, riding on rougher trails).
BTW, for others that may be looking for something similar, Will at Riv has told me that they will offer 64 cm frames in the 2026 Clem run (but not 64 cm completes). Hoping I don't have to wait that long, though.
thanks!
Chris Young
ABQ
P.S. I am actively scanning the Riv Buy/Sell site (wish I could get that to sort most recent items at the top!), craigslist, facebook marketplace and ebay. Whew!