I know, you are a big fan of chained GUI actions (clicking buttons, selecting menu items, …). Me not so much 
What about this:
Not completely “automized”, but dead simple.
If you really want to create dedicated LB actions to launch KM macros, then I would simply duplicate an existing one (in Action Editor, right-click on an action), adapt the name and paste the UUID into the script.
Once again, not automized. But not much gain by “automizing” it. Especially not when automizing it with a fragile GUI macro. (I know, Action Editor is not scriptable, but there isn’t much reason to make it scriptable.)