The bike has a obd or obII reader which must conform to certain standards.So german efficiency being what it is it will conform to the international specs for the relevant obd regs.
If you try to buy an actia 2000 it will only have mz info in it if it is programmed into it either directly or via stick etc. Software is only dear because we're conned into believing we need the official manufacturer's stuff. Most of the stuff is made in china anyway.
So the actia will still read the fault codes, but most people don't know what they mean, but you've got the workshop manual which shows what the codes are.
So why not buy a cheap obdII reader for about £30 off ebay. It's only going to interrogate the ecu and read back any fault code as a number. Obviously the mz one has additional software for tuning and making adjustments , but thats just software which at the moment you don't need.
I'm not a techno wizard but i think i'll waste £30 on ebay and give it a go, and if it works i can buy a better cheaper gizmo. The reason ,as you say when you make an enquiry about an Mz is simply because most have on the obd flash memory some data for say ford,volkwagen etc not an MZ. THE CODE BOOK IS THE MANUAL SURELY?
If it doen't work how many sf or s owners would be willing to chip in and buy a tool to share, after all it's not something you'd use everyday and would cost peanuts to post to one another on a self hire basis.