Hi,
A hex editing program can be used instead of the texture swapper program for the models that give the overflow message. It is preferable to use one with some text editing functions that allow you to replace all occurrences of the addon name, as manually changing each instance can be quite some work. Note that some models will restrict you in the name you can give your addon, so it is best to adopt a name that matches the number of characters of the original.
Regards,
Sander