Thanks guys. I contemplated June 9th but unfortunately my AONE6 end on June 7th. My new DONE5 begins on that day, so I need to be in CPT on the 7th.
Changing the travel dates to later is no option.
I am not that bothered enough that I want to pay €500,- for an NBO-CPT ticket. If that was cheaper I might have, if only for the TPs.
I feel cheated out of TPs (since I will now miss my Upgrade for 2) and bonus miles. That is why I am also looking for a way out. I will keep you posted...