Blog Templates - using 3 templates within Pro Sites

What I am trying to do is have 3 different themes and 3 different Easy Blogging layouts which are dependant upon which Pro Sites level they have.

For example:

Level 1 has a basic template and a basic easy blogging layout
Level 2 has basic template and a standard easy blogging layout
Level 3 has a better template and more options on easy blogging.

Level 4 - this is my main site so needs to keep the standard wordpress layout in the admin panel with access to everything.

Can this be done and if so how?

Also (this may be a different post) if I deal with the above via Pro-sites could I add the membership plugin to make people pay first then they get the site with the levels of membership?