I haven't used one, because I have no need as a civilian concealed carrier, but I have looked online at the Hogue ARS holsters. They have two types of active retention holsters for the CZ P-09. There's a level 1 retention holster that uses a thumb lever to release. Then there's a level 2 retention holster that also has the thumb lever and adds a hood for additional retention. You can find them floating around on Amazon or Ebay, so you should be able to get your hands on one without waiting for a custom order to be made. If I was looking to open carry my P-07, and didn't want to spend the time and money to get a Safariland made, I'd probably look at one of those.
There are also some other brands out there with different retention methods, usually with an index (trigger) finger button release. Which type you go with should be determined by your husband, depending on what he is comfortable with and/or what he was already trained to use.