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I'm all for exterior chain plates. Certainly if they have to be stainless.
When stainless is starved - oxygen-wise - you have to take crevice corrosion into the account. This is the reason one shouldn't use stainless under the waterline, unless it's a boat that is most often on a trailer.
[apparently I'm not allowed to post direct links :-( Anyway, copy/paste this into your browser:]
(it's a good explanation of crevice corrosion and how it adheres to stainless).
Now, If I had to have inboard chainplates, especially with a high stress modern rig (as opposed to a low-stress gaffer or lugger) I would take the chainplates apart, and if they're fine, I'd cover them with lanolin, before screwing them together and then keep replenishing them with lanolin at the top.
I wouldn't skip the taking them off the boat-part, because then your "fix" might actually do more harm than good: Starving the stainless even more.