It's only one datapoint, but at this very moment a server at work is using a notable amount of swap, 1.5 GiB to be more precise, while functioning perfectly normally.
$ free -h
total used free shared buff/cache available
Mem: 3.9Gi 1.7Gi 573Mi 180Mi 1.6Gi 1.7Gi
Swap: 4.0Gi 1.5Gi 2.5Gi
I wish you luck! Only time that’s happened before was memory leaks for me, and it didn’t go very long before death spiraling. But if you’re comfortable with it, enjoy.