Minion sacrifice with Elemental Sundering

Hello exiles.

Yesterday I was theorycrafting on some additional configuration of the spear weapon swap mechanic, and I suddenly hit a very thick wall. I think I need some help getting it to work, if possible.

It seems the Infernal Legion doesn't inflict a "ignite" ailment on minions, but rather a "burn" effect (like RF in PoE1). As you can see in the video, I'm trying to use them as ignited corpses with the "Sacrifice" aura so I can multiply my Elemental Sundering damage by the number of skeletons. Is there a faster and better way to do this?