May be add some fantasy content?

Considering most Philippines runs in the game are able to get independence fairly early around 1845-1850, I think you should lean on the immigration aspect as the opening to World Trade of the Philippines in 1834 was what lead to many of the transformative years to come in the country. One of those Johannes Zobel's success after migrating in 1832 to Manila which eventually led to the Ayala Family Business. Anything else from there is Fantasy.

There should also be a JE for whether you choose to prosper under Spanish Rule or Seek to Take the Reigns. Seeking to stay under spanish rule, you can safely follow to create JEs & events from the historical path while going for Independence leads to a more ahistorical future. Possibly leading to a "Nusantran Unification" akin to Maphilindo.

P.S. I wish the title for independence could've been "Punitin ang Cedula!" but that act was only introduced in 1854. Sadly there is little material to go by unless if we pull inspiration from the events the Philippines was relevant in the `Medieval Age` to the `Age of Discovery`. I imagine Sulu & Maguindanao should be able to fill that bubble. There's a lot of ways you can go about this.

Note: One way you can flavour the Philippines seeking independence is "continuing the Latin American Wars for Independence" which ended in 1833.

@Jaune Thanks for the input. I'll try to look into making content regarding staying within Spain's orbit. But currently it's focused on attaining Independence. There is currently some flavor regarding the opening of Manila due to the 1834 Royal Decree in my current development build that I'll release soon.