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.
I also have the 75BD. Do you plan to carry cocked and locked? If not, the BD is a great gun for the range and HD. Super accurate and feels great in the hand. I recently saw a 75b on Budsgunshop with night sights and 3 mags. Did you check there?
Yeah I too saw the 75b omega but I'd really like to stay under the $500 dollar range. I don't want the decocker because I would rather always br in single action. If I am able to be a b model I will change it to sao.