Is there any way to infuse henchmen?

I'm pretty sure I know the answer to this, but I don't think anybody can blame me for asking. I'm having a hard time wrapping my mind around the concept of the ultimate "slay henchmen" spell that will finally force me to group with more than just my friends plus however many henchmen we need. Why even include henchmen just to yank them away right before the end?

What about the "new" henchmen available after the Iron Mines? From what I can tell they are not infused, but do they at least have one infusion each? Is there any way to infuse them? As soon as I saw them I assumed they were there so I could pick a couple infused henchmen, but they seem to go down just as fast as the rest.

...does anybody else find this as incredibly lame as I do?