I’ve abandoned the two functional clutch levers setup I was so keen on. Instead, I’m running a bit of a compromise; the original clutch lever and cable remain and can be easily changed over for a two-armed rider. I’ve added two cable clamps; one to keep the second clutch cable up and out of the way (more presentable) and a small clamp to tie the two clutch cable inners together. The two cable inners operate together to activate the clutch switch.
The original front brake lever is replaced by a short brake lever to improve my emergency stops; index and middle finger operate the brake while ring and little finger operate the clutch lever. Seems to work so far.
360 degree video of the clutch being punished.