Spare halyard--what's the best line?

[JohnV]

Thanks for that reply, Stumble.
With external halyards, the tapered endura idea may not be best.
I guess I'm over-analyzing this, trying to get some utility out of a temporary messenger line and still benefit from its small size. The benefits diminish with compromise, though.
I'm probably best off with quarter-inch dacron double braid--something that will handle moderate weight if I need it to, will work on a winch, and still be a lot smaller than 7/16" sta-set x.
I don't expect to have to reeve a replacement halyard with it very often, if ever.
Thanks for the logical treatment of the options.
John