This was what I was looking forward to. It's great to read of FTers' experiences with the SIN-KUL shuttle and lounge access at SIN, so I can now report on our own test of SIN T3 and the SKL.
After many drinks, meals, movies and inflight power all in Y on Etihad, we made our way to the T2 transfer desk (from T1 IIRC) to change our MH F shuttle ticket to SQ F.

^