Passport Plus Awards for Platinum and Diamond elite level members – In addition to being unencumbered by blackout dates,Platinum and Diamond level members will have the added flexibility to redeem a hotel award for any available room within the award room type when they want, where they want. “Passport Plus” Awards require additional points and are not subject to capacity controls. This is similar to major frequent flyer program awards where miles are redeemed fo awards that are not subject to capacity controls.

You seem to need to pay a premium to get this service with an award ticket. There is no "premium" with stay play pay so technically your case does not seem to be covered by the rule.

Sounds like you may need to split your three nights.