I vaguely recall that Minox sold Copex Rapid film, but that's all I remember. The Minox experts over at the SUBCLUB might have more experience with it.
As to development, you can use any typical Copex Rapid (AKA, microfilm) processing. There are many to choose from, and they are basically just very low contrast (AKA, compensating) developers. Unfortunately, you don't have much to run tests on. "Normal" developers can be used -- but special techniques need to be employed to reduce the contrast.
Processing Minox film -- of any type -- is no different from processing 35mm or 120 or 4x5 film. I'm sure you'll get lots of suggestions from other here who have used Copex Rapid. I've only used Kodak and Fuji microfilm -- which is basically the same. For example, I use Fuji HS-U at ISO 50 and develop in D-76 (1+7) for 13 minutes.
Microfilm is great for Minox camera because of its almost nonexistent grain.