There is no issur of a woman becoming a shochet, and the arguments against it, quit frankly, fall flat.
The arguments against it? I’ll give you one–the Rema says so.
See, there is a very wide difference between my Judaism and the one you espouse. We aren’t practicing the same religion. I don’t know why you keep insisting that we are.
Minhagim also spells gehinnam.
Presumably to signify that one who abrogates minhagim will go to gehenom.
Hazal and the Rambam, among others, do not hold like those mostly Ashkenazic authorities you cite.
We follow Rema before the Rambam. Particularly where the minhag likely developed in the time in between.