This should be fairly easy to do using RT Midi (
http://www.music.mcgill.ca/~gary/rtmidi/)
Since there is a driver for it, you should be able to use it as an alsa midi device. There are a few ways to route alsa midi to jack midi. I personally recommend that you use the ALSA midi because more applications support it, and routing it to jack midi is fairly easy. (so I hear, but I've never had a need.)
I've actually made a program that takes events from a usb midi device (PCR M80) and turn them into MIDI CCs. Basically it reads a file that 'maps' events from the device to controller change events (outputting notes is fairly trivial using RT Midi). With qjackctl I route it jack-rack or rakarrack or gmidimonitor to test it. You can find it here:
http://bh_x.webs.com/x-11-mm.tar.gz
I know RT Midi is C++, but it's really easy to use.