If you want some experience there is no better way than sitting RHS in a single crew airplane. As Pace quite rightly points out, you won't be able to log the time because you won't be a required crew member.
If I were in your shoes I would look at the IOM register which is available on their web site to identify the single crew types, then drop the owners (shell companies mostly) a letter to say you are keen to build some experience and would love to help them out.
Even if you do get a few hours that you cannot count, it will be a great learning opportunity and a way to start the most important thing, which is networking.
Good luck!