There is no issur of a woman becoming a shochet, and the arguments against it, quit frankly, fall flat.
Comparing Jews to the left of you with Christian missionaries is highly unwarranted and inflammatory conduct.
Minhagim also spells gehinnam. Hazal and the Rambam, among others, do not hold like those mostly Ashkenazic authorities you cite.
And, it is funny you mention shechita. I spoke with a Hassidishe shochet who trains in ofot and he said that for unmarried men and non-Satmar men, it is enormously difficult to get any work, since Empire and Rubashkin both use Nirbarter hashgacha.