How to change/disable the 'overview' keyboard shortcut?

Left Super is bound by default to opening the ‘overview’. It doesn’t work for me. I noticed that I can change it to Right Super with the Twaks utility, but that isn’t much better.

How can I change it to an arbitrary combination (just like the other System shortcuts)?

You can’t. Allowing a key to act both as modifier and regular key is tricky, and has little overlap with the code path of regular shortcuts (one regular key with optional modifiers).

But there is a regular “Show the overview” shortcut in Settings you can use ( Supers by default).