Hi, nice that this is 'picked-up' again!
In my opinion: Kanban would best be:
- simple
- colors
- minimum 3 and maximum 5 columns:
** (Backlog)
** To Do
** In Progress
** Done
** (Archive)
Like i already mentioned somewhere up here: https://kanboard.org/ is my favorite. 
Ideal would be that it is a kind of seperated function inside Joplin like 'New Note', 'New To do' and then a third 'New Kanban'. 
But that's too much extra work i think.
Now i am using really simple Kanban way in Joplin like this:
- KANBAN (notebook)
** Backlog (sub notebook)
** ToDo (sub notebook)
** Progress (sub notebook)
** Done (sub notebook)
** Archive (sub notebook)
And i move only notes inside of them that have to do with the Kanban tasks.