Great! I see in the FP T&C as below. Is cancelling the eupgrade via phone and getting the comp upgrade without cancelling the PNR a workaround? It seems like the below T&C suggests the only official way to get a comped upgrade after you eupgrade is through cancelling the PNR and rebooking.

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• For Flight Pass bookings which include confirmed Star Alliance Upgrade Awards or eUpgraded flight(s), the traveller/sponsor's eUpgrade account will be decremented should the traveller wish to use their complimentary Flight Pass upgrade within 48 hours prior to departure. To re-credit your eUpgrade account, the upgraded booking must be cancelled and rebooked under a new booking reference in the original Latitude booking class. If the original flight(s) is no longer available, an alternate flight must be selected.”