Good for you Pug, keep thinking. When you think about why the priest consecrates his hands prior to touching the consecrated host the less it makes sense for our unconsecrated hands to be touching it. It’s not about germs, it’s about whether you believe in the Real Presence or not.
Ockham, you suggest here that the lavabo is a consecration of the priest’s hands. That didn’t cross my mind, since I would associate an idea of consecrating hands more with when he was ordained, and the oil was used upon his hands then, and he was handed a chalice. Wouldn’t a consecration of this type be abiding, and not need daily repeating? Why does the lavabo suggest to you that he is consecrating his hands then?
From the OT, I could cull the idea of the clean and unclean, and if his hands had touched the unclean, that they needed to be washed/purified before touching the clean, otherwise the contamination of unclean would spread.
But I grasp your idea here. The chalice, the paten, the corporal, a pyx if transporting, all of these are special items, special for the sacred species to rest upon (or fall upon). One would not set the Sacred Host upon an ordinary dinner plate that was used for ordinary things. Nor would one use a chalice to drink water from. It would be a jarring mix of the sacred with the profane/common/ordinary, and would feel wrong.
Clearly the Real Presence is what motivates us having all these special, devoted objects like chalices.
But, maybe you view the lavabo as a transitional action, between the two uses of a priest’s hands. From brushing his hair and eating breakfast, over to their use during mass. Hmmm. I’m still thinking, obviously. Anyway, here is what I found in my old A Catholic Dictionary:
…The *Lavabo *originated in the practical necessity of handling loaves of bread, etc.; it now signifies that purity with which the mysteries should be approached. When the celebrant is a bishop he washes his hands again after the ablutions…
Note: those ablutions were after communion.
My old missal says:
Originally the priest washed his hands because they had become soiled by handling the bread and flasks of wine, presented by the people at the Offertory. Now this act is a symbol of the inner purity with which the priest and faithful should approach the Sacrifice of the Lord.