Gotta tell you, from limited experience, 1BRs at VGC are tough. Early September is a popular time to visit. A 4-night block is really tough. I would highly recommend you have a Plan B. But never say never!
Depends what dates you’re looking for… September 4-7 is the runDisney Halloween Half Marathon Weekend, and those were booked up right at 11 months. I’d say highly unlikely for those dates