Actually activated and well diluted it could be sniffed up into the nose rather than inhaled and I think Humble mentions doing this this on his videos but whether this would reach the sinuses and area of infection.... Never done it myself.
I certainly wouldn't use it in a nebuliser
Maybe Colloidal Silver would be better for this though with less chance of irritation
Sniffing up Sea Salt water and sodium bicarb is what I do