[tqx]

No, it will not override the CSS (not sure what you mean by "accessibility enabled" exactly).

> even with the focus outline disabled on other sites, I am able to navigate with the keyboard to text input fields

Correct, but for a user with vision problems, the focus outline lets them see what has focus. CSS doesn't stop them from inputting values.

Focus styles are essential and should not be removed as a best practice (in general, this is a very small site).