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crossedthread
There's Campy-Mano combos which work and the answer is hidden in the interwebs.
It's the pull ratio of the various brands and series which fucks things up.
TBH anything 9 speed and below are workable between Shimano road and MTB, anything above that is a mish mash.
I've seen a few BUT never have the interest or will to look into it deeper. Maybe that's why my mind blocks it out.
To illustrate, Tiagra 4600 and 105 rear mech are interchangeable, no other 10 speed mech works. BUT 9 speed MTB mechs are close enough to work with it.
Tl;dr: Doable but time consuming.