The correct option is Manually replace github.com with github.dev in the address bar.

If the period key does not work on a non US keyboard, you can still open the GitHub web editor by changing the domain in the URL from github.com to github.dev. This directly loads the repository in the lightweight editor and avoids any dependence on a specific keyboard layout or shortcut.

Open the repository in Cloud Shell Editor is not related to GitHub and would open a different editor in Google Cloud rather than the GitHub web editor, so it would not accomplish the goal.

Use a private browsing window does not affect how the GitHub web editor is launched and it does not resolve keyboard mapping issues, so it would not open the editor in the described scenario.

Update the browser to the latest version is unnecessary for this situation because the web editor can be opened by URL and the problem described is with a keyboard shortcut rather than browser compatibility.

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