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The obvious fix is a patch to their javascript to remove the scalarmult that's applied to the key you enter in the textbox so it uses it directly as a public key rather than treating it as a private key and trying to derive a public key from it.

(Then of course you have to edit the config file it generates for you to remove where it put your public key in a place that was supposed to hold a private key, but that's a step you're supposed to need to do anyway, except for the "removing something that wasn't supposed to be prefilled for you to begin with" step.)

But I'm bad at browser hacking/js stuff.