Somewhat to my surprise, I am going to make diamond this year. I had a last-minute trip over the Christmas holidays that is going to put me to diamond. However. I would really like to change the outbound part of this flight. Unfortunately, if I do that, I come up 15 miles short of diamond because the light gets cheaper

i can cancel and rebook the entire trip as fully refundable and get the miles but that’s another $500. I really want to split the difference and do one segment, fully refundable and one segment as a discount. Can they do this is if I call?