Instead of a Hyfield, consider perhaps a small (say 1/4"w sheaves) high-load set of blocks w/a 4 or 6-1 purchase, reeved with Amsteel or other synthetic line. Use a normal 1x19 shroud made up shorter than needed with a thimble on the low end, attach blocks with to that with a shackle, and same attachment* for them to your deck fitting. That line could even be led aft so that you could slack the solent when tacking.

Just a thought...

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*...what's the strength rating on a lifeline pelican hook?