From my experience, yes, there are local gals in KTVs. Most of the KTVs i've been to has this percentage make up:
70% PRC / 20% Viet / 10% SG/MY
or
50% Viet / 40% PRC / 10% SG/MY
This is from what i've noticed, might differ from what the other brudders out there have seen.