Thanks.
It just so happens I needed to go from Bali to London in September

and can now cancel my award flights via HKG. (once the e-ticket is confirmed and assuming nobody reports tickets being cancelled unilaterally by PR)
I booked via Expedia in case PR gets frisky on the mistake fare. I couldn't get a stopover to price properly though, as I might have been inclined to go check out the new Conrad hotel in Manila.