I use round spring gate clips mostly. I've tried adding dogleash clips to some but I don't like the way they make the charms stick out weirdly.
Like these: https://www.amazon.com/Spring-Carabiner-Trigger-Keyring-Buckle/dp/B07C51LTW3
These are the first that came up in a search. There might be some sellers on ebay that will sell a mixed set of gold and silver, although right now it looks like you only need silver. You can use binder clips too but they might not be as secure.
ETA: That pink owl is one the first fobs I bought. I got it when it first came out in 2011.
Thanks for the suggestion! These clips would be a good solution, but I was kind of hoping to find something that let them dangle a bit more. I do like the way the ball chain connector looks, but it’s just too flimsy. I found this chain extender that gives me the look I want, but this one in particular is too expensive and I’m having trouble finding

I am thinking of switching them to a gold or brass to better match my bags hardware.