I am unsure, Shardlet.
You've obviously put a great deal of thought and effort into this, so might well have answers to my concerns, but I'd like to raise a few anyway, just in case:
Why not lobby for an expansion of permissions for Theoryland, rather than start a somewhat-clunky setup here? The thing is, when you've got a few hundred WoB's, you need to be able to separate them out by keyword and subject and the like, which is what Theoryland is good for. Now Theoryland does have a flaw in that it lags behind on new WoB by a fair margin, but that's the kind of thing that can be worked on within the system (admins willing).
I don't see Theoryland as a challenge to "adequately mine for information", but as a challenge to the need for a separate compendium to exist.
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On that note, such a thread might be helpful as an interim step to getting stuff into Theoryland. I'd like to think that my compendium of AMA answers relating to the Cosmere was helpful to those guys, and this could serve a similar purpose. Instead of being a copy-pasting of new WoB's, you could maintain a series of links to the relevant threads/posts, to be removed as Windy, Joe, and company get to them.