Realm loop problem with TBC 2.0.10

Running Mangos tbc 2.0.10, and can host publicly just fine, but getting realm loop issues from within the network. This was a classic problem with the 1.12.x, which was fine, just change your host files to point to the server...
I have discovered that you cannot add more than one realm in the realmlist for tbc, it locks everyone up (unlike 1.12.x), the problem that i am having is that I already host a 1.12.x (along with a tbc), and can play within the network on 1.12.x, but not tbc. The realm port for tbc is 3725, so you have to plug that in when connecting from outside the network.
Is there a way to edit your host file to point to the tbc server (with port)from within the network, so network users can play?