FWIW, I also used phpMyAdmin like 20 years ago for ad-hoc queries like this when I couldn't get to a proper terminal shell. Assuming it's still maintained, setup is probably still as dumb simple as it was then. You just need to put the DB host/name/credentials into a file on the server that it can read, and it does all the rest. I can't remember if it could just take the connection options as form inputs, but I wouldn't be surprised if it can now. Have you looked at recent versions?
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