Remove Vocabulary from content (with patch)

I have a case where I want to clear all terms from new content for a give vocabulary and assign a default term.

Currently I have to load all the terms, delete the ones I don't want from the content and assign the term I do want. This means my triggers action loads five terms, deletes four terms and assigns one term.

The patch adds a option to delete all vocabulary terms from the content. This means that trigger action now removes vocabulary, loads term, assigns term. Three steps are much simpler than ten.

Please go easy on me as this is my first attempt at adding code to rules and the code might needs some tweaking, clean up, etc.

Thoughts?