The loading issues of jack lines are covered pretty extensively in The riggers apprentice. We used 5/16 12 strand spectra for our jack lines. Running from a dedicated pad eye to the bow sprit base. My only issue, which I guess is why people usually use web, is the round line on deck being a trip hazard. Depending on what your comfortable with running them high and outboard as some people do would alleviate that.
Jake
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