Well, I took the plunge — the dress is at the tailor with some tops that need hemming and some pants that need the waist taken in! They seemed confident it would work well cut off into a top. We allowed for a little extra length to accommodate a little scrunching at the waist, should it occur.
I realized I had also recently been interested in adding a pretty patterned mesh top back into my wardrobe, but none I’ve tried or looked at seemed to work for my preferences (why so many little mock turtlenecks?). If this alteration is successful, I have my new mesh top!