It works as far as creating a second taskbar shortcut, but they seem to have some crossover. After following all the steps very carefully twice, the intended effect of which shortcut goes to which profile appears to depend on which I select first.
The default profile when opened opens my regular profile, but if the 2nd one is already open it opens that one. However if the default is open first and the 2nd is opened second, there is no problem. Is there a way to fix that so I can fix that?