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@retrodicorsa
You may just about get enough travel on a 7spd but the indexing won't work - different generation mechs have different mechanical advantage when it comes to how far they move for a given movement in the cable. If you want a full explanation and to give yourself a headache read the legendary 'Shimergo' article here:
http://www.ctc.org.uk/Default.aspx?TabID=3946
For that reason I would recommend any Shimano 9/10 speed rear mech! Or old skool friction shifters (Simplex FTW).