The only thing I can think of is changing it manually. That's a lot of work, but TVDB helps you along a little. If you click on an absolute episode listing, it will also show you the Aired and DVD episode listing at the top of the screen, such as this...
I'm not certain because I only used it for a little while, but I think FileBot has an option to convert Absolute to Aired with TVDB. I know others disagree with me (and that's alright), but I found that FileBot was very complicated to use.