I use zip-ties for my silencers. Love them! You can get them very tight if you pull them closed with pliers, yet you can slide them if you need to for tuning. I've used them with cat whiskers and they look fine, but they really shine with wool puffs, you can't even see them once the wool ball blooms.
I wondered about using them for nock points, but I was concerned with movement and I really love dental floss for nock point.
I love zip-ties for darn near everything. Always have some close at hand.