Welcome to our Greyt Family! As Dan said, there is no other way to put it...you are hired!! After such an in-depth post, I can see you have given this a lot of thought. Not many people do put that kind of research and effort into their choices for a companion, so hat's off to you!
The others have offered you great advice and thoughts. I feel you would be a wonderful owner to a grey. Just remember as time goes on and you start your life: girlfriend/wife, perhaps kids and other pets. Your grey or any other parrot will ALWAYS have to be in your life. As life changes, they will adapt, but you need to make the commitment that they will have a forever home with you no matter what the potential wife if given thinks...(Just my opinion)
I did want to mention that I have 3 parrots, I was a stay at home mom with 4 kids, got divorced, moved into another house, acquired more pets (dogs, cats) and was home most of the time, my birds were out most of the days with me. Fast forward several years later, I work away from home full time, so they are now in their cages much of the day. I let them out for about 1 to 1 1/2 hours in the am for breakfast and play time. Then they go into their cages for the day and come out around 5 -5:30 until bedtime. Of course the weekends, they are out most of the time during the day. I was concerned about the change in schedules and lack of out of cage time that they were so used to all their lives, but they adapted very well. I leave videos, tv, and or music on for them. So if your work schedule changes, your bird will adapt just fine as long as it has time out with you..
Please keep us updated. An feel free to post and ask any questions.