I haven't figured out the details yet but the plan is to glass in a PVC chase on either side of the pulpit and I will run copper tubing through these with a removable nozzle on each side, it will take some trial and error to find a nozzle effective for a relatively low flow and easy to service for sediment/corrosion from raw water. The copper tubing will allow me to manually adjust for the right angle while trying to say out of harm's way. i am sure I will mangle a few before I get it dialed in but they should be easy to replace.
When I installed a nozzle to spray on the chain, I mounted it to the underside of the pulpit board, a couple of inches back of the chain, so right under the roller. I used a piece of 1/2" copper water pipe, with the nozzle formed by flattening the pipe in a vice. It took only a couple of tries to get the correct amount of flattening, so that the pressure of my salt water pump created a fan of salt water against the chain that is adequate to dislodge mud from the rising chain. That nozzle is attached to a pex water pipe that is T-d off the saltwater line as it comes up through the deck and connects to the bow washdown hose.