You can actually fly from HK to MLE using points from BA (Transfer from Chase to BA)
but dates are very limited especially if you are looking for direct flight.

I found tix for 4 (one way) from HKG to MLE direct flight on 06/29 for 50k + $113 Economy.
The main cost I think for Maldives is the Seaplane or boat ride from the Airport to the Island. Some nicer hotel like Park Hyatt and St Regis is upward $550 per person.

Good luck!