I got a little bit of good news today. I found out that 7.3 was accidentally set as an HD channel by WBBJ, but that they are working to correct the problem, and that it should be available on Charter soon without having to have the HD package.
I was also told that they eventually want to have ME-TV on its own subchannel, but that they have to make technical improvements first, and they hope to have it on in the future. So it sounds like we'll have ME-TV full time in the future, just not at the present time. I'll give it time and see if they keep their promises.