Thank you and sorry for so many questions, but I have one more. I hear what you're saying about excess material outside of the e and g, but wouldn't the string spacing on the new, less wide nut be slightly smaller than the existing one?No.
Nuts set string height over first few frets and string spacing. How much excess material there is outside of E & G is of no consequence.
Tusq does have blank nuts that are 1.75. I guess I could line up the old one and file new slots myself in the worst case scenario.