HKG-KUL
KUL-HKG
Other good options are:
KUL-LHR
LHR-KUL
Although - as it's a redemption booking that won't EARN miles, given KUL/LHR is long haul - if you're in high earning economy or biz class - the LOSS of miles earning from redeeming miles is not worthwhile if you have elite status.
Now, all my credit card points now to go KrisFlyer.
The removal of the "use miles" radio button was a stealth devaluation by ~10% (as far as I can tell based on my experience in redemptions).