Originally Posted by
shelbyfv
Microshift has bar end shifters in both 10 and 11 speed that work with Shimano MTB (Dynasys?) rear derailleurs. I think the SGS versions may have the range.
As does Gevenalle.
Like it or not, I think the OP is due for a 2x11 mountain drivetrain. One way or another.
I set up my wifes bike with a 28-44 crankset by taking the 44 off a triple & spacing it inboard with some 2.1mm washers & mated it to an 11-42 cassette. 18 to 108 gear inches all operated via Gevenalle brifters.
Similar can be done with Shimano 11 speed road (if the OP is a brand loyalist) & a Wolf Tooth Tanpan.
Taking the above Schlumpf posts into consideration, the Microshift or Gevenalle may be the less expensive proposal. I still don't think cooking along in small cogs is ideal, but at least the range the OP wants is covered.