2stop,
My experience is that they may not even talk to you. I have considered this for my son too, so I don't think you are thinking wrong. If I think it...how can it be wrong??
My son is in jail and I was told he could request literature from the chaplin and he did. He got a 12 &12 and 4th edition BB...I am sure the services would be available for your brother too. Again I doubt if the jail would provide help if he does not ask. I was not allowed to drop off literature but I think I could mail it. Maybe that is something you could do.
I personally don't think it would hurt anything to try. But watch getting your hopes up. You know all too well that HE is the one who has to want it.
Hugs,
JT