That will take long, what I think is needed is for China to create/boost their own comprador group. Like exclusive trade deals with the pro China oligarch groups. Nudging chinese importers from getting their import product from their pro chinese Filipino exporters. Because the pro western oligarch will feel the squeeze, given that the west will go into recession. I think this will pay itself back in like 20 years.The current situation concerning the new US bases is one of the main reasons why I proposed a while back for China to exponentially increase Chinese immigration into the Philippines, when there is enough Chinese diaspora in the Philippines, they will have a bigger influence in Philippine politics, and because of their affinity to Chinese identity, they can lobby the government to keep at least a neutral position in matters concerning Chinese and US rivalry in the region. The Chinese community in the Philippines already control a huge chunk of the country's business and finance industry, imagine if the Chinese population in the country is even bigger; they will surely have an enormous influence in politics as well.
It pains me to say this but I don't see any other way in the medium term future to sway the Philippines for a long time and not do the constant 6 year dance between a pro or anti chinese government.