Wouldnt it work if he 'added' his 35k users to his larger db, then synced them? The only thing that I would think would have to be looked at is salts and license keys.
I tried to get a 'shared user across multiple sites' thing going for awhile. In the end, you either just cant do it without massive amounts of file edits or by switching to IPB who have offered this functionality for some time now
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