Bruja, You seem to be smart, realistic and reasonable so I only caution you to not get your hopes too high. While I appreciate the anxiety that you're feeling, there is little you can do if he's unwilling to accept your efforts so worrying over something you can't control is not doing you any good.
I'm not wishing to be negative but keep in mind that your brother initiated the rift 12 years ago without concern for your happiness or welfare. He now has nothing to lose as he took the steps to cut you from hs life. He controls what he will accept and what he won't even if what he won't accept seems petty or juvinile.
Although you are understandably desperate to re-establish a normal family relationship, he only seems "open" to communicating with you now and then from afar.
You may find that he may appear to sabotage efforts to restore your relationship, possibly because he's not convinced that he should be talking with you or he may be feeling anxiety which he doesn't know how to deal with. He may be feeling conflict as he long ago believed it proper to remove you completely from his life when you were Df'd, yet now he is questioning and reconsidering that belief even though your status hasn't changed. The WT had him convinced that by shunning you, he would be showing you love to cause you to reconsider your actions and thereby return to being a JW. It's easy to see that didn't work in your case.
After so many years of no interaction, he is now somewhat of a stranger to you and may not be the same person that you had known previously.