It's great to hear that you managed to get it to work! We don't have this functionality built-in, but we will reference this scenario to every one else who needs this. By the way, here's the link
where we discuss the dynamic change of the themes (the one you have provided is broken).
We would like to thank you for contributing this great tip as well as the wurfl library reference. We have updated your telerik account for that.
the Telerik team