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xort, some of the "gitrot" type pentrating epoxies would be perfect for that. They're designed to be thin and suck into cracks, and into the wood itself. They won't add the strength of conventional epoxies--but they'll do a better job of creeping in and sealing what you've got. I'd start with a smallish pour, just in case that crack is open on the bottom and they can run away through it.
You're not going to be plugging the only air space that lets those stringers breath and dry out, are you?
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