You can buy them when booking something and you no longer need to be out of points.
So, you can ask to buy..at 7 months or less…when booking and leave your own points alone.
If you want to replace points you already have in a reservation, and that was booked 7 months or less…they can’t be used in a booking made in the home resort period…then you have to make a fake reservation at least 31 days in advance, but in the same UY of your trip.
Cancel it and then have the points reallocated.