Activating and Using multiple themes

I’m trying to set up a site where a client can go in (without needing admin rights to activate themes) and view a WP website with multiple themes installed and working in different pages. I.e. the 2014 theme working on the home page; 2012 on a second page, some other one on a third page, etc. Is there a way to do that? I’m comfortable digging into the code if necessary just wondering what would be the best way to go about doing that? Since multiple themes can’t be active at once (as far as I know) I would assume it would use includes somehow…

Thanks for any help.
Allne.