I took EscapeArtist's excellent advice and rigged the emergency till on my Tayana 42 yesterday. Ah, that is a lovely chartplotter I had installed! If I punch a hole through it I could probably get that tiller rigged. Actually, given the aft location of my helm I don't think the tiller would have worked even without the plotter. The only way I can rig it, without cutting it down to an unusable length, is with the tiller out to port or starboard. I haven't tried to stear it that way yet but it seems to me the helm interfering with the tiller issue is probably not unique to my boat.
Excellent advice from EA and others, you don't want to be finding suprises when you really need it.