Hello, my name is Roger Rodríguez, first of all, I should specify that I read the part where you asked for US, Can or UK specifically, but if you check my profile out, you will notice that my writing skills are on level, if not higher than most native speakers, since I have a C2 level of proficiency, which gives me the license to teach the language and certify me as a native speaker.
I can also give you my other samples, and a free section of your project for you to judge.
Thank you for your time.
Kind regards, Roger.