So basically what you're wanting is a CZ Shadowline Compact. Unfortunately for you, they were a limited run. They also only come in a safety configuration with no firing pin block. They do come up for sale on the usual used markets every now and then.
As for the regular P-01 vs Omega, the lock work is different. Imega can be swapped between safety and decocker, but the clean up of the trigger will not be as precise as a regular P-01.
If you're dead set on a decocker, you're looking for a CZ Custom Pro-Tek 2. They lighten the slides on them by doing a more aggressive octagon slide cut. Those are also limited editions and usually sell out. You can purchase one from them and ask about them doing the work.
CZ Custom or Cajun Gun Works can both do the things you're asking for though.