Mr./Mrs. are evolutions of language, like you said. They don't really refer to the original words for the most part. Mx. is an evolution of the same language and just as easy to pronounce. Sure, it's a "bandaid" if you want to call it that, but the English language is 90% bandaids. To rule out this one when there isn't a good alternative for general use (prof. or teacher would be fine for this person, but not for someone who's not a teacher) is pretty narrow minded.