I was thinking of doing the same, then realized I didn't even make it to real Silver (which they downgraded me to), so it might be asking a bit much. After being Plat for 2 years and gold last year, I would like the benefit of the doubt, but at the same time the reason I slipped so much with NW miles this year was the plan to move 100% to AA anyway since OW gets me to Australia easier (from BKK) which is where most of my travels now take me.
But if you have any luck, would like to know, after enjoying NW for awhile I kind of have doubts about letting go and no thinking could I get in 50K miles before the end of feb...
Cheers