The intake for my head appears to be clogged, or at least partially
clogged.

I'm having a diver clean the bottom soon, and I'll have him be extra
sure to check the thru-hull,

but, if that fails, what is my next move?

Not sure how to clear the hose/thruhull without letting plenty of water
in the boat.

also, I'd prefer to avoid being sprayed with "head juice"

Peggy? Anyone?

Thanks,

Mike.