It seems that you have an aptitude and passion for teaching. Have you considered maybe doing some Learning and Development work? I would think the skills are similar and therefore transferable. I don't know how easy it would be to get in to but I sure you'd be able to some professional qualifications that would aid your progress. Also, there a different types of businesses out there requiring Learning and Development professionals so you could find an industry that you believed in.
Actually, JamDrop, most of the work is reading, researching and studying. I've spent far more hours doing that, rather than the outdoor work (which I love).