Yes, I finally found out via Canon in Norway: The Canon Media configuration tool pushes the information about the newly defined paper to the printer (I actually found the ICC for MOAB on the printer itself), but for the new paper to be visible in the printing dialogue on the Mac, the system info has to collect that info back from the printer (!).
So, I had to go to System Preferences/Printers & scanners in the Apple menu of the Mac, choose the Canon Pro-2000/Options and Supplies/Utility, then open Printer Utility, Choose Media Information from the drop-down, then click OK in the panel, then wait for the system to be updated, then restart the program you are printing from.
Voila - the new paper type is visible, and can be selected in the print dialogue.
Logical? Well....