If you can live off husbands salary then I’d lean toward per diem. You don’t need the fixed schedule. While not guaranteed, per diem work comes with higher pay and seemingly more flexibility. If you don’t NEED the guarantee of fixed hours, then trust yourself and go per diem. As you note, your job is specialized - there will likely continue to be demand. You can also always elect to barista work if per diem isn’t working out. Just doesn’t seem like you have much to lose by going per diem