Stick with friction / ratchet based shifters and many things are compatible with each other..

You might find another type of friction lever to have the lever somewhere else ,
off the stem..

Ends of the Handle bar, thumbshifters on the top center of the bar ,
you will still be holding on with both hands in those cases
and onto the down tube , a classic racers location when remaining low over the bars for aerodynamics, short cable = quick shifts.

drop the 'let the mech do it for me ' problems , that syncing lever /cable pull,parallelogram translation into lateral motion
and spacing of each cog on rear cluster, thing , Its all gotta be dialed in ,

Whereas with friction shifting it's just a simple motor skill that you do with your hand..
with each shift you make small adjustments.