So my recommendations for the stay:
+ Book any Club room if commercially/money feasible
+ Before booking the room you should call Hyatt Gold Passport and ask them if there is availability on the requested dates for the 3,000 points certificates for the upgrade for up to four nights to the Club rooms. So you could book the non club room and upgrade this during reservation.
+ If you donīt have the 3,000 points in your GoldPassport account just buy them (think they are about 54 Euros per 3,000 points, you can buy them in increments of 1,000 points for approx. 18 Euros)

Does the Diamond status upgrade you to a Club room? Or do you still need to use the 3,000 points?