They could add a lowercase to FE-Schrift (i.e. the German licence plate typeface, which was designed to make it very difficult to make any glyph look like anything but itself) and use that for the URL field.

In addition, if you attempt to visit a site that is a homograph of one already in your browser history the browser should show a warning, highlight the similarity and force you to confirm you want to proceed.

Makes sense that they can't figure out how to instruct people to change their browser's DNS settings