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Bob Yak Trailer: Triple-New Grenade Pin Straps
It turned out those window screen splines lasted a dozen years until this happened:

Bob YAK trailer – splitting screen spline Some rummaging in the Big Box o’ String produced the spool of 1000 pound test Kevlar cord most recently applied to the seat back on Mary’s bike, so this happened:

Bob YAK trailer – Kevlar cords Having re-confirmed that frayed Kevlar cannot be melted into a blob, another UV-stabilized cable tie at each end will control those tufts.
Those cords should last forever …