If you have sufficient UR points you can transfer them to your wife and she can convert them into Marriott points, then to WN.
Depending how you value 7 nights at a really nice Marriott, this may be a better way to accomplish your goal. For example, 7 nights at a Marriott cat. 7 plus 70K WN points costs 280K Marriott. Worth at least taking a look at if you can use a week at a Marriott. 70K WN would "cost" 116667 Hyatt, by my calculations.
Or cat. 8 for 30K more Marriott points. Some of those can run $500+ a night.
Also if you are an Amtrak customer, UR>Amtrak>Choice>WN can be worthwhile, up to a limit (25K/50K Amtrak per calendar year). There are restrictions, though.
Last edited by toomanybooks; Jul 31, 2012 at 6:31 pm