I use Rings as a resonator for external input, or as a drum voice, and I find the nano version to be ājust fineā for my needs. To offset the ergonomic concerns I had MSW construct my module using alpha metal shaft pots with panel nuts, so the action is as solid and smooth as any full-size module.
If you wanted to use Rings more as an instrument unto itself then you should consider a factory unit first. For me, changing a knob position on Rings usually means disaster since I carefully set-and-forget its tuning and rely instead on CV modulation. For this, the stiff and small alpha pots are perfect! Plus I honestly donāt like most of my āhand modulatedā results from Rings (too easy to get too Rings-y).
In contrast, I would never again try to shrink Elements, Frames, Plaits, or Tides. They are either too much fun to play by hand, or too perfectly designed for ergo. Selfishly I wish someone would make a microBlinds, though!