What, if any, requirements would be necessary if I were to re-license a script/file released under the GPL to a MPL/GPL dual license other than the appropriate boilerplate?
The approval of all the copyright holders.
Since the MPL/GPL dual license gives the option to use the file under the GPL, does the re-license violate the original GPL?
Yes. Section 4: "You may not copy, modify, sublicense, or distribute the Program except as expressly provided under this License."
Since the end user has the option to use the file under the GPL, would it be necessary to obtain permission from the initial developer for the license change?
Yes. You can't take a file and say "You can use this under my new license. Oh, you can use the old one as well if you want" without the copyright holder's permission.
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