As a teacher, I can't stand that route - taking the Praxis toward certification in an area in which you have no experience.
with one exception - I have a colleague who's an excellent SPEDucator. She is always paired with an English teacher for grade 9 inclusion. Because she's spent YEARS co-teaching in English, she took her Praxis in English and aced it. If I were a parent, I'd have complete faith in her ability to teach.
However, in your case I'd have my doubts. Don't help dumb down the profession. Get a degree in English as a second language.