Is it really that big a deal? I say wear it on your non dominant hand, the one that you would normally wear a wrist watch on. Since you are used to a watch on that arm, it makes sense that it would be more comfortable for you that way.
Just because your inflator hose is on the left side of the BC doesn't mean you can't reach accross with your right hand to use it. Most BC's have dump valves in other places that would allow you to vent just as easily as using the hose. Unless you are a BRAND NEW diver, you don't hang onto your inflator hose all the time anyway. Even durring an ascent you only grab it to vent for a second, then let go.
I'm sorry for sounding harsh, but geez.....it amazes me that people feel the need to ask a question about something like this, in fear of doing it "the wrong way". Just relax, go dive and let some good ol' common sense prevail. I'll stop now before I start an entire new thread.
Mike Rushton
PADI DM 174448