specific registration url ?

Hi,

I use a default blog template on my website subscriptions.

But i need to give another template only by "personal invitation". I don't want to have a selection box on my registration page.

Is it possible to give a link by email like that ? ==> /register/?blog_template=xxxx

I did a check with a personnal url like that, but it's the "default" blog template who has opened...
(This option is unchecked on settings ==> Show templates selection on registration)

Is it possible to give a personal registration link with another blog template but without showing templates selection on registration page ?

Thank you.