Pro Sites Reserved plugins and themes


Is it possible to install themes and plugins that are only for my use? I would like to create some sites that use themes and plugins that are not generally available to any levels.

I was thinking I could creatw a level of membership for only me, but I don’t see how that could work.

Maybe I could enable them for a givem level, use them and then set the level to none. This could be awkward. Any sugestions?