@Gordon ******
OK. Read it for the fourth time and think I understand it now. So! This comes up a lot. Answer seems to be... See how you get on.
Yes, you can enter visa exempt and extend, no problem.
May have an issue with return (onward travel) beyond initial 30 days. Just hbe prepared and maybe either rent a ticket from one of those websites os buy a cheap ticket to KL on the spot. Just give yourself some time. Immigration isn't the problem really, itl be the airiines.