My wife and I are currently booked for LAX-DOH-SGN in June (Business Award seats), with a 2hr5m connection in DOH.
Is there a way for me to change the DOH-SGN leg to a later flight for a longer connection, so we can really enjoy Al Safwa lounge. I called in and asked an agent but they said thats not possible without cancelling and rebooking which I don't want to do (we all know how hard it is to find award availability).

Any tips on getting this to happen before my trip so I can book destination hotels accordingly?