I posted earlier about the F3 visa. Now I have learned that no-one on an F3 visa is allowed to earn money working in korea. However they are allowed to do voluntary work for charities and the like.
My new question is, as schools have the right to determine the required qualifications for those working in their schools, has anybody heard of a school supporting an application for a mature native english speaker with a TESOL Certificate and much life experience to get an E2 Visa.