I don't think so. And you don't want a stretchy cord anyway.
Polyester is also low stretch, and the cords I use—Lawson Glowire and Guywire—have a jacket/core (kernmantle) construction with the core being Spectra (?) or some such. Break strength of 1.75mm Zing-it published as ~500lb and 2mm Glowire as ~250lb, so for the application you're looking at mega-overkill and slight overkill on strength.
But Zing-it is spliceable and Glowire/Guywire are not, although they are great at holding friction knots and Zing-it is not at all.
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