Originally Posted by
Bill Kapaun
Mountain FDER's have a different pull ratio than Road FDER's
Rear cable can be used for the new front.
I can confirm that Microshift brifters work with Shimano mountain rear derailers but not mountain front derailers.
Another option is bar-end shifters. Those would also allow you to use long-pull drop bar brake levers and avoid the Travel Agents.