Yes, this SHOULD work. However, it has been reported that some FDCs have stated, as do most T&Cs, the member must STAY & PAY for the room. That even a spouse paying would negate the points posting. I don't agree and I don't recall reading a resolution to the post where I read it.

Buying the GCs can be a good solution and allow you to get the benefit for future travel when the promo is over.