I find it very interesting, but just had nothing to add. I'm only replying because you seem to think no one cares
I've been meaning to do similar experimets my self, but didn't get around to it just yet...
How about just boiling some water and adding 0.9% salt in it? Perhaps not 100% sterile, but neither is your mask, mouth, sinuses etc...Still should be better than seawater.
I don't think a wet equalization technique will ever be so perfect, that it would be useful for recreational or frequent diving, because how every you perform it, the risk of infection is always very real. But it may be very beneficial in record attemt/personal best type of diving...And naturally FRC diving...
