why not open an SPG card for chassan and for kallah and stay wherever you want?
Excellent idea. The sign-up bonuses between both will pay for even a Cat 7 hotel in NYC -- Even the St. Regis! Now that would be a lovely place to stay...
But IMO, kind of a waste of point that could be leverage much better to stay in a Cat 3 or 4 property on vacation at some future time...