can't you just "skin" msn by removing all the buttons and images from convo. then it will be a blank window, but you can still type and read. Then but the top menu bar in notepad as the background, or just leave the one thats in the convo, then change your font to the one in notepad and use plus!'s feature to override contact's font?
If you don't know how to "skin" it, ask some members on the forum