CZ USA used to sell spur hammers that are awesome for a crisp trigger pull. I've used a couple and I got 3 lb. SA trigger pulls that are so "crisp" they feel lighter than 3 lbs. Put a trigger pull ga. on them and you won't believe it really is 3 lbs.
On the other hand, those hammers are narrower at the top than the Pre B hammers and would look funny if the hammer is down in the notch in the back of the slide due to the gap on either side of them.
Don't know if they still sell those or not.
CZ75B .40 S&W with one of those hammers (and a CZ85 slide release system). These hammers are made for the B model guns so they don't look funny on them.