controversial as he might be durianrider has loads of vids on youtube where he's showing his road bike with an xt crankset 22/34 or something like that, using a band on xt mech and re routing the cable for top pull.
I think the issue with such small rings is the mech needs to sit so low it ends up fouling the chainstay, hence the need for an mtb mech too. However if you're only going as low as a 30t you should be ok i'd imagine.
If you're interested I've got an old square taper campag triple with bb and mech from my old touring setup which I'd sell cheap
controversial as he might be durianrider has loads of vids on youtube where he's showing his road bike with an xt crankset 22/34 or something like that, using a band on xt mech and re routing the cable for top pull.
I think the issue with such small rings is the mech needs to sit so low it ends up fouling the chainstay, hence the need for an mtb mech too. However if you're only going as low as a 30t you should be ok i'd imagine.
If you're interested I've got an old square taper campag triple with bb and mech from my old touring setup which I'd sell cheap