Federally registered MLOs only get one NMLS registration. It follows them wherever they go, they just have to keep the info updated. It is not a state specific number. Does Utah require federally registered MLOs to be licensed? Unless the state of Utah has additional requirements for bank MLOs to operate in their state, the NMLS registration your MLOs currently have is sufficient for them to originate a loan in Utah. There would be no concern for how many loans they have originated if they are already registered.
Regardless, I don't think you can use the de minimis provision on a state by state basis. The MLO has either originated more then 5 covered loans or they haven't. I don't see any provision in the regulation for how many loans they originate by jurisdiction.
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I can't herd the cats anymore, so I just set up the electric fences and let them fry when they stray out of bounds.