Oliver Heins wrote:

...

But be warned, this part of luatex is not fully developed yet: if you remove an item from the tex.lists.contrib_head pointer you may end up crashing luatex (this is because luatex has already decide what node it will use to break the page before calling the buildpage_filter)

Uuuh, that sounds dangerous. Perhaps I am on the wrong track.

Sorry, this bit of the code is just a mess right now, and I have no time to look into it immediately. Looks like you will have to wait until next year. Best wishes, Taco