Blog Templates not showing in "themes" in dashboard

I've installed Blog Templates, and it's working well when you create a new site in Pro Sites.

However - after you've created a site, and you go to "themes" in the dashboard of that new site, the theme that shows up is still the original theme (in this case the "spirit" theme).

Can I change the name and thumbnail of that theme to reflect the name I gave it in New Blog Templates?

And can I have my other templates in this area - the same ones that are available during the signup process (based on existing blogs)?

Or once you've chosen one - are you stuck with it?