Nikon Fog Eliminator
I've used them on eyeglasses in very cold weather. They helped for a short time, but were a long way from eliminating the fogging problem I was having. They might help on your binos, but I would predict it would only be short term. Doubt whether there would be any issue with the Pentax coatings, but I would be leery of constantly wiping anything on a bino lens. More lens coatings get scratched from overdoing it with cleaners and lens cloths than anything out in the field.
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