Just an FYI
Contrary to the old wiki and what's listed on the website, QR seems to be using the Plaza Premium lounge at KUL now. I thought it was just for the 2am flight, when the MH lounges are still open, but all the catering has pretty much been cleared away; but some other people I know were on the 8pm and it was the same story
Obviously you can go to the MH lounges because of OW, but I wouldn't bother unless you are a OW Emerald on the 8pm flight (in which case you can go to the a la carte dining room in the MH Plat lounge). The PP is pretty tired these days, but not as tired and busy as the MH lounges...