Possible To Assign Page/Post Templates Per Level?

Is it possible to include Page (built in to Wordpress) and/or Post (available through use of a plugin such as Custom Post Templates) templates in the list of items that can be controlled through Pro Sites? Page and Post templates are an alternative to full theme development and can be created for specific functions, such as a webinar page, a client portal, a coaching form, etc.

If so, how?

If not, can you think of a workaround, or jury rigged solution?