Freeport congrats on the 7 months sober.
Sounds like you have a good plan, if I may suggest one thing.... instead of waiting until he is there face to face to tell him you are serious about not drinking, perhaps it would be a good idea to tell him before he gets there, it will give him some time to digest it.
I have a feeling that there is more then just drinking that ties the 2 of you together, he is your brother after all which means there is blood and history that link the 2 of you together.
My son did both Iran & Afganistan, it messed with his head a bit, but he is getting help for that and has also quit drinking which has helped him deal with things instead of escaping things.