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Their official line is it doesn't work, but in theory it should. Would be good to know if you get it working.
Polygon-
Because the 4700 share the exact same pull ratio as the 11 speed stuff, this mean that for instance I am able to run a 5800 derailleur with 4700 shifters.
In theory, I can't see why it would not work at all, I can get the Shimano SLX M7000 derailleur, add a 11-46 and the Jtek adaptor with a double chainset (it's advised against, but I reckon I can make it work).
edscoble
Excellent! given that the Tiagra 4700 share the same cable pull as the Shimano 11 speed road, I reckon I can make it work with the MTB 11 speed derailleur and 10 speed set up.