When I was getting all of my ratings at Aviator College in Florida we had a UH60 guy come in a knock out his instrument and multi commercial in 21 days while he was on leave. The school set aside a dedicated instructor for him to fly with multiple times a day and they got it done. From what I understood the GI bill paid for all of that. As far as the atp written I'm not sure what to do there. PM me and I'll give you more details about the flight school there.