Hi,
I definitely wouldn't recommend doing what you want to do, for several reasons:
1. It will be hard to find the model when you need to update it.
2. Django is built with defaults in mind - and when you go outside the defaults you are working against the framework and not with it.
But that being said, you can probably do what you want with the help of the meta options on a django model:
Specifically the app_label property - you should be able to use. The only thing you need to do then is make sure that the file is "loaded" when django starts up somehow.