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If the user self-associates by clicking a tracked link, you don't need any custom anything.
The Munchkin cookie isn't appropriate as a GA User ID. It's far better to use the Marketo Lead ID unless it is definitively unavailable (as will soon be the case w/Anonymous Marketo leads). The definition of a GA User ID is that it be non-personally-identifiable and tied to a single human user.
The list is missing .MILL. That was probably a typo, but more important, there aren't enough exclusions. Needs to at least cover a-z0-9+=@,Consider:john.mil@example.comjohn.mil+retail@example.comjohn.doe@example.mil.newsenfa.mil=joe@example.comAll perf'ly valid addresses w/common formats.And there...
When it's required/desirable to persist custom field values I like to use pending leads (as distinguished from both anonymous and named leads).Pending leads use the Munchkin cookie as the synthetic email address, together with a boolean that signifies that they are in the special area between anon a...