[beardyw]

What you are doing sounds like a very worthwhile thing - not everyone is Stephen Hawking. You should set up a project homepage now if you don't have one, GitHub is free and quick, and put a link here. That way you can present your idea properly and people can contribute ideas.

Monetary switches can be had for next to nothing, you just need a housing (for a one off I would use a plastic pill bottle).

Will look out for your link.