5 point templates, logic_case, all five items.
Each point template is linked to one item.
Logic case points to each point template with the forceSpawn input.
Breakable object links to the logic case with the pickRandomCase input.
And you'll need to do that for each ore cube. I don't think there's a lighter way to do that.
You may be able to use only the 5 point templates and the 5 items and use the entity teleport...stuff to move it to a location in the world, but I am unclear on how to use those entities. And you'd still need one teleport "exit" per ore cube and a way to know which exit is the active one.