It might be possible if your willing to throw enough money and parts at it. I suspect the cost would be nearly as much as buying a second pistol.
Wouldn't it be cheaper to just order the one you want? Just because they don't have what you want in stock doesn't mean you can't get it.
Call these guys: http://czcustom.com/
If they can't find you what you want, they should be able to tell you if a conversion is possible.
FWIW, I have a 75BD, it's a great pistol as is.
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