I ended up asked my D’s guidance counselor for a list of what periods each day her scheduled classes were offered, plus those we wanted to switch to.
I did the Sudoku/origami to fInd a schedule that included what we wanted and provided it back to her counselor, who made the switch. It was a lot faster than one question at a time about each class, to a counselor who is probably busy with dozens of kids trying to do the same.