> Finally, in the keyboard shortcuts bind Super to the xfce4-popup-whiskermenu command, to bring up whisker menu for a text search.

I've had this trigger the popup menu when there is another shortcut that binds the Super key in combination with something else. Say, if I had something under Super+R, then the menu would also open. Though maybe this has been patched out in the newer versions, I remember that issue being the case in an XFCE desktop from 2020.

But other than that, this is indeed a really nice and usable setup!