I have a question on how to waitlist a Suites award from LAX to SIN and continuing on to KUL in J.

My current award is booked on Business all the way from LAX-SIN-KUL.

Given that even with Suites availability, I would need to call them up to book Suites award because SIN-KUL is highest at J only. Is it possible to call them to place a waitlist?

Any idea on the chances for Suites to open up? I checked and 7/12 suites are already taken on the date I'm flying.