M_Boats: Outhaul and reef point boom hardware

I am planning to add an outhaul and second reef point hardware to my M15, and have some questions: -What is the recommended way to mount hardware to the boom? I don't want to have stainless rivets fail from galvanic corrosion. I've thought about using plastic shoulder bushings and bolts, but that wouldn't let the hardware mount perfectly flush. -Does anyone have hardware recommendations for the reef point and outhaul? -Is an internal outhaul worthwhile? Sincerely, Tyler Davis, CA M15 #157 "Defiant"