Using Digital Piano Sounds in reverse w/MIDI

This might sound like a strange question, but I own a Roland HP603 digital piano. It has 256 preset sounds in it. I want to record a song with one of these presets, but the song is too difficult to play using the fully weighted keys of my Roland. I need a semi weighted key to pull off the performance.

Is there anyway I can trigger the built in preset sounds of my ROLAND using my M-Audio keystation midi controller? I'm guessing no, but I though I would ask.

Regards,

Ray