Well..don't have a Oxygen 8 (yet ;o)....just bought a MK-461C on Ebay today...where driver is also available there...
Final goal is to write a generic USB Midi driver....that's why I'm collecting drivers all over the place to disassemble them for study...
I would vote that people should upload DAW drivers here as well...as many legacy drivers can't be found anymore...
If you want to make a generic driver you could start with writing a class compliant driver and any new hardware that complies with the USB 1.1 MIDI standard would work. If your interested here are the pieces you would need to write it. This is all pretty well documented stuff.
Here's the link to the OMS SDK which you would need to make sure OMS knows about the device.
http://macos9lives.com/smforum/index.php/topic,2130.msg10956.html#msg10956Then you hvae the USB Spec for midi (everything you should need to know to write a driver) This is in the attached midi10.pdf document.
And lastly the USB DDK from Apple for writing USB drivers. (usb_api_ref_v26.pdf attachment.)
Now if you meant like a global driver that has hardware specific parts for lots of drivers then collect lots of them and put them together. Or create an installer that let's you pick the ones you want.