Would this work?
You wait for a travel advisory to come up where fees are waived, pay the change fee to switch to that day (it would only be a day or two out though) and then get a free cancellation (refund) because of the travel advisory? You would want to know if this works for sure because if not, you have a ticket that you cant refund your miles on again.

Could you do this with a revenue ticket to get your money back minus the change fee?