I have checked with all american sites not associated with ABMC maintained by the Amercian Association of the Philippines, The American Chamber of Commerce, VFW, American Legion, Masons, Elks, etc located at North Cemetery.
Your last option may be to call the La Loma Cemetery located in Q.C. and see if they can be of assistance. We have no contact with them as officially all americans were moved after WWII (in theory).
La Loma Catholic Cemetery
Remember to prefix the area code with the International dialing number from USA which I think is 011.
Good Luck/Leg R Mull