Donny,
Sounds like you'll need to first figure out what the handclaps sound should actually be playing and then remap the handclap sounds to the appropriate sound.

Donny, I'm sure that you aren't the first person to encounter this specific problem. As Frank suggests, I'm sure there must be someone out there with a drumkit re-mapping (note transposition) software utility which will allow you to easily re-map your GM midi file's drums to match the PSR9000's XG drumkit with just a click of a button. Many of the higher end midi sequencer software programs support just this type of drum re-mapping utility.

Good luck,

Scott