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I agree that he couldn't have become a Nazgul because his spirit was not the weak thing as that of a mortal man, but was Maiar. But even Maiar have Hierarchies, Degrees of Power and Authority, one over the other, and it sounds possible that Curunirs ring could fall under the sway of the One.
But bear in mind again that Sauruman was an "Originator" of a ring in the same spiritual order as the other "originator" of the One Ring, being both separated by time in an non-allied endeavor in their ring attempts. Therefore, while, in the case of the Elven rings, Sauron never touched them and yet they fell under the power of the One anyway, this happened because as the originator of the basic lore, it was Saurons special influence and sorcery that made them subject to him.
Saurumans ring-making was an entirely independent attempt based loosely on his own "Ring Craft" knowledge and power, and on the the gleanings from the notes of the Elves of Eregion who made them, which left Saurons influence out of it completely. Saruman would certainly have thought of this before making a ring.
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