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Master Mariner
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You are way over thinking this one. You need to keep your work in control, as the glass around the steel is much softer; grinders and the like can do much damage. A wire wheel in a drill should expose the steel. There are needle guns for this kind of work, but frankly this job just isn't large enough to warrant that sort of tool, so I'd use a chipping hammer to remove the scale and again the wire brush to polish the metal. Then you'll want to use Ospho to stop any rust until you can begin rust proofing the steel with whatever company's products you choose. Since it's underwater, a tar/epoxy is a good insulator and barrier coat. But every company has a series of coverings, from primer to undercoat and then the barrier coat before the bottom paint, and I would stick with one product line. One other route would be to take the pintals and gudgeons off and have them hot dipped galvanized, and painted. This would definitely extend their lifespan, but perhaps not cost/labor effective.
As mentioned in the other thread, your pintals and gudgeons should have been bronze, but I'm pretty sure these are not. Even if you do a perfect job of rust proofing the brackets themselves, I doubt there will be any way to keep the pins from rusting (unless you hot dip galvanize), so inspect them regularly.
 
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