sounds like you have a wonderful support system and Orion will have lots of friends in his flock.
one little suggestion, bring Orion home on a Saturday morning so you will have the first two days to be with him while he settles in to his new home. During those 2 days tell him you have to go out for a little while, but you'll be back soon. Maybe start with 20 or 30 minute "trips," then an hour or two, and each time that he sees you return home after you leave, he'll feel more secure when you have to leave him for work or longer periods of time.
I would also recommend reading Sally Blanchard's, "The Companion Parrot Handbook." Despite having had an African Grey for 18 years and reading years of "Bird Talk," I still learned a lot of valuable information.
Companion Parrot Handbook
Congratulations and best of luck on your new relationship. It's very exciting.