-
Yeah, I thought I'd seen it done so went looking...
Both our gravel bikes are 2x so if I wanted to go lower gears I'd probably just try Roadlink with a 46T cassette. Actually, the grrl's cassette is worn out so I might just buy a 46T to try it out...
-
There's no reason why couldn't run road shifters and MTB RD&FD if you wanted to go 2x. The MTB front derailleurs only word with small chainrings though, so you'd be limited on gearing. I imagine that with all things Shimano the figures they give are conservative and you could probably get away with slightly larger rings than they suggest for MTB FDs. I doubt it would work happily with standard or compact road chainrings though.
Japan don't like the mullet? How sad.
https://bikepacking.com/gear/guide-to-mullet-drivetrains/