Yup - use thread. Not just any, and there is some work, but...
Buy WHITE cotton thread, but HUNT for the right stuff - as "hairless" as possible. You will never find non-hairy completely, but that's OK. With a glove and a paper towel soaked in flat black, rub your thread (small sections just longer than you'll use finished). It doesn't take much paint, HARDLY ANY AT ALL. If you mess up with not enough you can see white/gray spots. You don't want to use much because you don't want to make the thread thick and stiff, all you're REALLY doing is just making the hairs lie down and stay down forever.
Drill a hole, poke thread in, tie knot, drop of CA glue. Draw TIIIIIIIIIIIGHT, knot, CA glue, done. My boat has been finished about 4-ish yrs, every line is tight and doesn't sag. Wire kinks, sometimes sags, mono fil is too hard to work with and too stiff.
There's another product I got a sample pack of, very nice but expensive: rubber line, called EZ-line. It's for telephone pole rigging on model train layouts. Stretches to about 3x it's length (advertising says 7, but...). Glues with CA. Nice, but thread works awesome. EZ-line was invented because apparently it's common to brush against the rigging on a model train layout and snap poles...Not a prob on boats (hopefully!)
My 2 cents.
