i ride R25 daily to work/everywhere as well.
i use xena alarm lock (without using alarm function even when it has it because imho too sensitive) for my front disc and the free disc lock from shop for my rear disc and of course the bike's built in handle bar lock.
my office is at first avenue (1 Utama), its more "civilized" so incidents are almost nil here.
a lot of riders leave their jacket/helmets on their bikes too so that says something.
if you're not so fortunate to park at guarded place with rich people/tenants, then consider getting another chain or something to tie the bike down to a pillar or something similar
or if you got colleagues/riders coming in/out at the same time, can consider tying multiple bikes together however can be inconvenient as must share key and if one leaves the other is a lone bike which needs something else to die down to.
this is to prevent people hoisting the entire bike up a pickup truck or similar methods.
then there's people stealing accessories, i've got 2-3 friends faced the same fate, replacements are in the 2-6k (one friend had to claim total lost because there's nothing left besides the engine/frame) because theirs are bigger/more expensive bikes with brembos.
the best way is still to park responsibly and prudently. try to park at guarded basements with guards patrolling to guard cars as well.
use this.