I'm platinum and so is my partner. My date is June and his is January. If either of us havn't flown enough and arn't quite there with the 800 sc's per year we plan ahead, and the other makes sure the numbers are there via family transfer.
Honestly can't see why I'd try to get up to 1600 sc's for a guest platinum as well (is that what it is?)unless your wife doesn't fly at all.You can just pass the excess over to her membership prior to you flighting.
Just puzzled, maybe it works for you.
Certainly worth making sure your assessment dates are a long way apart. definitely not at the same time. Would be very tricky then. (Could that happen if you qualify for a guest platinum?)