I can't just drop the tilde in both cases because then it doesn't make sense. The best I can come up with is (transliterated) "Dona Ana New Mexico where the first n has a tilde over it is one of the few US place names with a tilde in its official name."
That's cumbersome.
Without punctuation, how do you express "eats shoots and leaves" as being different from "eats, shoots and leaves"; that being the punchline to the joke ending "Panda. Large black-and-white bear-like mammal, native to China. Eats, shoots and leaves." (See http://en.wikipedia.org/wiki/Eats,_Shoots_%26_Leaves )