Ask contract cleaning companies like Merry Maids or sparkle maids, I think they're called and see if they have any folks from the Philippines on their books. I wouldn't hold my breath though, as this city is 95% Chinese re local homogeneous population.
Hiring somebody else's helper on a restricted W hkid visa could land you a hefty 6 figure fine, an upto 9 month jail term and a cancellation of any conditional visa you may be on, deportation. plus your passport info black flagged from entering Hong Kong for 3 years.
That's the worst case scenario of course, but HK immigration are pretty slack at following this sort of breach up. It's usually somebody that knows you that will lag you into the authorities, most ' smart' people wouldn't expose themselves to such a career ending risk.