Enable "hex numpad" input as described on https://en.wikipedia.org/wiki/Unicode_input#In_Microsoft_Windows (remember to reboot/log out as noted there for this to take effect).

Now try to enter a Hebrew ע character with Alt+05E2 (again, see the detailed description at that link for how to do this).  In Notepad, this works: as long as you're in the middle of the hex sequence, the "e" and "f" characters do not trigger the "edit" and "file" menus as they otherwise do (and as they do even in the middle of the sequence if EnableHexNumpad is off).  In Chrome, however, these keys always trigger the Chrome menu; it is impossible to enter hex sequences with an e or f character.

Mike, I wonder if you want to take a crack at this :)

(There's another way of entering Unicode that CRichEditCtrl supports and Textfield doesn't: enter a hex sequence and then hit alt-x.  This is also described at the link above.  This seems a bit easier to implement but perhaps less useful.)