Most importantly, the setup should allow for Nicole to freewheel at any time and not have to pedal constantly. She loves cycling but can only pedal in bursts.
The Hase Pino or Circe Morpheus look like suitable candidates, but ‘upright’ independent-pedalling tandems are thin on the ground. You may be able to find an engineering company willing to experiment in this area. See the website davincitandems.com for ideas.
Cycle’s Technical Editor