Disney doesn't "buy back" perse. You can offer your points for sale to a resaler, let them take their 12% cut from it and maybe have Disney buy it through the ROFR process. Disney does "buy back" some, but at a severely reduced rate (like $55/point was what I read from CarolMN).
It seems to me it is easiest to just keep what you have and book at SSR at the 7 month window instead.