... or you could try to edit the style adding the missing part (after all you are a drummer, aren't you?), or could program a multipad to play on top of the style.
Re. Donny's suggestion, you could use the midifile to convert it to a style, complete with intro, verse, chorus, fills, etc.
The most difficult part will be transposing all the chord changes so that the part you will be converting will play in the same chord (usually Cmaj7).