I think this post you made is the best way to do it. I see the applicants for that job are hidden from the public, so there is no way to contact them for you (due to privacy issues).

I think this post can be viewed by those applicants if they follow Musicians page, even more if they subscribed to this forum (Music Opportunities). Most of our users are subscribed to this forum, so they'll probably see this post.

Thank you again.