How do I find an E.E. to partner with for a product?
You could approach a local University's, electronics (or electrical engineering or computing) department to see if they might have some reasonably competent students who might be interested in a part time project of this nature (think hands on work experience which pays). Depending on the nature of the project you might also be able to partner up with the uni to offer it as a project to students for some aspect of their course.

Just my tuppence worth.

Amos