Publish at the Open University as an undergraduate
At the risk of sounding obvious let me share some advice that will not be specific to OU.

First, wherever you are, you can do research on your own, although it's usually a tough call while being at the undergraduate level. 

A somewhat more realistic option could be locating and contacting the academics in your field at a university reasonably close to your location (so that you can at some point contact them in person) and get them interested in supervising your research jointly with the OU people or on their own.

The problem with the second option is how to get the people at your local university interested in working with you but perhaps you could get some letters of recommendation from your teachers at OU to help your cause.