Are you saying there is no (http) RFC compliant way to fix this, or no way to fix it with the email library parsers?  If the latter, the library is pretty flexible and for internal stdlib use it would probably be permissible to directly call methods in the internal parsing module, if those would be useful.

I haven't re-read the issue to reload my brain, so this question may be off point (except for the first clause of the question).