G'Day Fella's,
Tommy Tree, if you are unable to locate a Gunsmith that is knowledgeable of CZ Rimfire triggers, as was suggested above, fit a Timney trigger to it.
I can usually get a factory CZ/Brno #2 trigger down to a safe 2 1/2 to 3 pounds, without to much trouble but I'm half way around the planet from you!
You may also need to get a Gunsmith to install the Timney for you as well, so either way, you may need to see a good Gunsmith..............
Hope that helps
Doh!
Homer