Old sun tour power ratchet bar end shifters have been reliable fot over 30 years
As the gadget mongers went nuts with all these I got more than you, 'speeds' Thing ..
they seem to show a Bar end/thumb shifter for Nexus 8 speed IGH which may be all thats left after all the others
Versus and such dropped out..
They may have been the subcontractor that made the Versus Brifter after all ..