What I am interested in adding to my CZ stable is a 75 Compact in 9mm, alloy frame, with a safety, not a decocker.
Unfortunately, you are out of luck when it comes to your CZ preferences. Your options in a compact CZ are:
1. 75 Compact, 9mm -- Steel frame, no light rail, safety. Should be compatible with your Kadet.
2. PCR (or "75D") -- Alloy frame, no light rail, decocker. Should be compatible with your Kadet.
3. P-01 -- Alloy frame, has a light rail, decocker. Should be compatible with your Kadet.
4. Canik C-100 -- A Turkish CZ clone. Alloy frame, no light rail, safety. Doesn't work with the CZ Kadet.
CZ isn't currently selling an alloy compact with a safety; there is a CZ P-02 available in Europe, but they are nearly impossible to find here in the States. The Canik C-100 is a pretty nice gun, but it isn't a CZ and the Kadet kit doesn't seem to fit (at least it doesn't on my C-100.)