AFAIK ptr_for_handle and handle are only for entities, for other structures you have to use something else, like

my.skill10 = fBeep;
pFunction = *(void)my.skill10;

I am almost sure it is wrong, because i'm not very familiar with all pointer-based stuff, maybe some users with C knowledge can help you

EDIT: you can use "Edit" button to modify or edit your previous posts, please dont post twice