I have created a custom GPT for copy editing pasted or uploaded text in Australian English.
It includes all of my rules, refined over a ton of books, as well as a simple and terse way of presenting the errors so that can be quickly found and corrected in the original text.
Here it is:
Official description:
An Australian English copy editor that reviews pasted or uploaded text for common errors.
It’s also in the GPT marketplace.
Here’s the icon I made for it:
If you use it or find it useful, let me know.