Hi Emily,
When I read your post the fondamental question that comes to my mind is how do you want to present to the world, as a male or as a female? It would seem to me that your legal status is a secondary issue and I am pretty sure you can have GRS and not have your legal status changed. As it happens, for many people, doing GRS is a prerequisite for a change in legal status so I guess that takes care of that question.
However, getting back to my question, if your intention is to continue presenting to the world as a male, why would you want to throw in the complexity of having a vagina instead of a penis? If I ask this question it's because I did GRS precisely to make it that much easier to live and present to the world as a woman which can be quite complicated when you have a penis so I guess the opposite would also be true (see FTM threads for plenty of confirmation)
I am of course aware that for some people here, suffering from severe genital dysphoria, GRS is pretty well an end in itself but I would still think very, very hard about the value in doing such surgery if the intent is to continue presenting to the world as a male.
Take care!
Donna