what about training as an english teacher, then doing whatever exams are necessary to work as a dance teacher/examiner outside of a school? dance classes and the like.
i dont mean the last bit to sound dismissive, i just dont know how dance exams work.
that way, you're qualified as both, if that makes sense. you'll have QTS as (the more employable option i think) an english teacher, but you'll also be qualified as a dance teacher. you may be able to convince a school to take you on as a dance teacher based on your QTS, or you could offer to teach english, but run dance as a club.