I'm a big Homes fan so here's a few random thoughts on you stage performance... for what they're worth.
Most of the audience doesn't have a clue as to what Sherlock smoked in the original stories. They're image of him is with a calabash.
A real calabash is, in my opinion, too valuable and fragile to risk getting broken during the production.
I would get a cheap, bent stem pipe which, I'm sure, would suit the audience, and if broken would not be a big loss.
During your performance you will be thinking about your lines and other things, not about the pipe, so I would suggest you fill it with some drug store tobacco full of PG that stays lit without much attention. That is... if you intend to smoke on stage.
Break a leg!