This is one of my most consistently used life hacks.
key rings are extremely durable, perfectly shaped to pull on, better than regular zipper tabs most of the time, keyrings are the perfect replacement.
Anytime I see a good key ring, I pop it into my tools pocket for the next failed zipper tab.
I buy all of my bags second hand because if they are missing a zipper tab, they're deemed useless and sold for a couple of dollars even if they're otherwise brand new.
If I need a bag of a specific type, I go around the thrift stores, find the exact bag/suitcase I want that's new but missing a couple zipper tabs, and after I buy it and take it home, throw a couple key rings on and have exactly the bag I want.
I've actually made more than a few connections with people because their suitcases broke and I had an "aha" fix ready to go for them.
a great short-term fix, but a little flimsy and difficult to grab for extended use.