No, you can't use all your points at one resort until 7 months.
What we've occasionally done is booked as many nights as we can at our preferred resort for that stay and booked the other resort we own at 11 months. At 7 months, we contact MS to see if we can cancel the other resort booking and use its points to add nights.
However, that likely works for us because DH needs a particular type of handicap accessible room. It might easily not be possible for non-HA rooms, particularly a studio. Also, we book the 1br, generally the most often available at 7 months.