While I'm aware of that (that the mangos server software doesn't "send the message",) this is the closest forum a discussion like this would belong in. Mangos forums for use and operation of a server, yes? Part of the operation of a server 'could' include server messages. Just because it doesn't deal with the actual .exe file doesn't mean it's not part of running a mangos server.. Where it clearly doesn't belong would be say, the database forums.
Anywho - I got mine set up and working via the methods discussed in the above links (was away from puter awhile). Now that I've seen it can work, I'll start plugging away at the realmlist.wtf and see if there might be an override that is usable from there. Originally thought maybe to provide a batch file to update the required file, but since you have to reboot for that file to be re-read (or maybe cycle the net adapter at the least) that isn't really a viable solution. More to come..