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Well, Bergen successfully overcame this deficiency, if one could call it that, for 20 years on radio. Charlie McCarthy was (and is) one of the best-loved figures on radio.
I, like I'm sure many other children on hearing Bergen & McCarthy, checked out a book on ventriloquism from the library and tried to learn the tricks of the trade. As I quickly learned (and didn't have the patience to overcome), speaking without moving your mouth isn't that hard until you get to the "B", "M" and "P". Those are a bit trickier. Poor Bergen... everytime Charlie called his name, he had do the "B" sound.