I use these for my zipper locks most most and most people wouldn't know how to unlock these. I get these free from work is what I use at festivals to lock my bags.

Lucky Line 5” Twisty Lock Key Ring, Flexible Nylon Coated Steel Wire Loop, Corrosion-Resistant and Durable, Black, 5 Pack (8112005) https://www.amazon.com/dp/B013WB8WBM/ref=cm_sw_r_apan_i_KJ7C67PY55XFQG4YHGN6

What I do is the following:

I have my entire keychain on one of these https://smile.amazon.com/gp/product/B013WB8WBM/

and its flexible enough that I don't have to remove the yubikey to plug it into anything. But if I ever need to remove it, its easy to do so.

I tried those Nite Ize S-Biner quick disconnects in the past for my bicycle key and the S-Biner broke