Can you put a reward booking on hold with BA? I thought holds only worked for revenue bookings?

I was thinking about this the other day. Let's say you wanted HKG-NRT but it was only available as part of a married segment. Would a solution would be to book a connecting itinerary such as PVG-HKG-NRT and then either cancel the PVG-HKG within the cooling off period, or if you are a GGL at any time later on just leaving HKG-NRT on the booking?