It’s more of a Tanfoglio clone than CZ 75, even though both are inspired by the CZ 75.
The Rock Island MAPP, Tanfoglio Force, Bul Cherokee and Sar B6 are all very similar pistols. They may even be the same pistol but I’m not 100% sure on that. You could check with those manufacturers and ask them if they sell threaded barrels. And Rock Island should be able to confirm to you if it is compatible with the similar models.
Sar sells threaded barrels on their website https://sarusa.com/
They list a threaded barrel for the B6 but it is out of stock. And although the MAPP and B6 look the same I’m not 100% sure if the barrels are compatible. The manufacturers should be able to tell you though.