The following are excerpts from the book
Philippine Ancestral Gold, which deals mainly with local 10th to 13th century AD artifacts.
We can see that in the area of craftsmanship then, only Philippines was at par with Java in the region.
I understand that this is not a direct proof with regard to the subject of this thread. I guess my only point is that the Philippines too must have had influenced Java a lot, in the general area of design of cultural objects, which included weapons.