Unfortunately I have found few resources for drummers or percussionists, but I’ll post more if I get them.
Jean Kaluza is a drummer with focal dystonia in her hand and foot. Changing her grip has enabled her to continue playing. Kaluza, like Billy McLaughlin, also does advocacy work for the DMRF, raising funds and awareness about general dystonias.
It is possible to make a donation and find out more about her work here.