Has anyone ever used Campy flat bar shifters? I'd like to convert a drop bar bike to flat bar. Rather than replace group with a new one I'm thinking about the Campy flat bar shifters. Problem is nobody stocks them. Even my LBS said they're virtually impossilbe to get, he tried. I was thinking about using Shimano with a Shiftmate. Problem is Shimano uses an indexed ft shifter. Campy's actuation ratio on their front derailleurs isn't compatible with Shimano and JTEK doesn't make a front shiftmate. I could change front derailleurs but then where does is end?

Can't remember the company,but someone out there makes high end thumbies. You could always just get a set of them and use them in friction mode.

Are you thinking of these?...

https://www.paulcomp.com/rdthumbie.html

You could put moustache bars on. These are boutique flat bars with an interesting curve and they use road levers - but rotated so that are in flat bar position.

I'm using barcons now so, moustache bars work nicely. I was trying to keep it with a set of riser or flat bars. It's more of an experiment than anything else. Though the Paul thumbies, mentioned above, would work also.

In March I replaced the drop bar on a Surly LHT with a flat bar, installed MTB brake levers, and moved the barcon shifters to Paul thumbies. The Paul thumbies+barcons are a great setup.

I converted my Specialized Sequoia to flat bar. I run Duraace barend shifters mounted in my barends. I just love friction shifting. No muss no fuss and easy to adjust.