How to Create a Bootable Windows 10 USB Using Only macOS

I was playing around by turning my Windows PC into a Chromebook, but then I realized I didn't have Windows installation media and couldn't revert it. So, I will create a bootable USB that can install Windows 10 using only a Mac.
(Assuming you already have the ISO for installation and a license.)

When you search online, many methods come up, but quite a few of them didn't work well.

Success

Creating Windows installation media with Boot Camp Assistant

This succeeded without having to do anything particularly elaborate.

Unknown

Dual boot or virtual environment

Basically, all you need is a running Windows 10 environment, so if you have a Boot Camp license, you can just run Windows with that.
You could also create a virtual machine with Microsoft Edge Developer, but the licensing situation is a bit ambiguous.

Failure

Writing ISO with diskutil

This is the first method that comes up when searching online, but I couldn't boot from the USB I wrote to.

Writing with UNetbootin

For some reason, UNetbootin does not start (Catalina).