HDU,
I don't know if Leupold makes a QD ring set for BRNO/CZ or not, but I don't think so. I know that Warne and Talley both produce good quality QD rings for those rifles. Burris makes a ring set but I'm pretty sure they aren't QD.

Also, since the levers are on the opposite side of the action from the bolt, it would be hard to bump them accidently. They are quite tight when properly set. I have QD mounts of my Remington 700 .30-06 with the screw type clamps and I wish they were lever.

I would also think that on a DG rifle you wouldn't want to fuss with finding a coin or screwdriver when it's time to remove the scope. That might have to be done quickly...

Here are some web sites:

Warne rings for BRNO/CZ 550

Talley QD rings