Accessibility for a Draggable, Droppable and Sortable component

This is a component that I'm trying to make accessible:

enter image description here

As I understand, the ARIA Authoring Practices guidelines for drag and drop is basically:

  1. Tab to move through the list of items
  2. Space to select an item
  3. Arrow keys to switch between the dropzone(s)
  4. Enter to Drop

.. which works fine to get the items within the drop zone, but I wonder how should the sortable work?

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