Export theme to PowerPoint?

Is it possible to export a theme to PowerPoint? I usually design the theme for clients, not their actual slides, so it would be ultimately most useful if I could actually export the theme for them to use.

Or, if that's not possible, what's the easiest way to achieve this? My marketing contact has a PC, so I'll be sending her my exported file and then figuring out how to save it as a theme on her PC in her PowerPoint before she sends it to the clients. Am I going to have to copy/paste pages into master pages in PP? Whatever is the easiest way and the least time I have to spend in PP is preferred! 🙂

Thanks for any help!!