Will this work?

All right so what I have is a 30gal tank with a 1/4 quick release. So what I’m planing on doing is converting the qr to a 3/8 into the 1/2 hose then into a ball valve and finally into the horn. Will this work or is there a better way?

Well it depends on the size of the port on the tank. If the port is only 1/4 then it isnt going to push much air thru.