Create new page from page field after parent is chosen in prereq. page field?

[hellomoto]

I have a page field 'make', which consists of manufacturer template pages. A new page can be created from that field, but I currently have that functionality disabled, since following that field is another page field 'model' with a custom selector, 'parent=page.make, template=model'. So since the model field parent is dynamic, new pages cannot be created from the field, as the first requirement for that feature is that a single parent and template be pre-selected... 

Is there some way I can hook into the options there and add an 'Add New' option at the bottom, opening up the new model in a modal? Thanks.