Command to open directly "download new plasma widgets"

Widgets are an essential part of Plasma/KDE, and I have always found rather odd and cumbersome the way of accessing the interface to install them, by

  • right-clicking the panel or the desktop,
  • selecting “Add widgets”, then:
  • “Get new widgets”, then:
  • "Download new… …

Can we get a command (and a launcher for that) that would simply open this window?

Already posted on U & L.