Dranianos aren't really Filipino, at least not in the sense of having a culture based on the Philippines and speaking any of the Filipino languages. They are defined as a mixed race group consisting of a Spanish and Korean component, and speak Spanish with Korean loanwords, very much unlike RL Filipinos. My understanding is that the Filipino part comes from the fact that the Philippines were the only Spanish colony in Asia, mirroring the situation of Drania/Dankuk, the only Dovani nation with an Egelian influence. As for RL Filipino cultural influence on Dankuk I honestly don't believe I've ever seen any in RP, but if there were any then it could very easily be explained as Tukarese cultural influence. The House of Aynako, the former royal dynasty of Tukarali, merged with Dankuk's House of Ryeo, and could have thus brought some of their native Tukarese culture with them (more details
here).
My CP update proposal is primarily aimed at restoring a cultural element that had been part of Tukarali without radically changing the current culture. Tukarali will continue to be based on Brazil and other Portuguese-speaking cultures, only that its indigenous population with be Filipino. There will also be opportunity for the use of Tagalog, Cebuano, and Ilocano, languages not present anywhere else in PT and relatively easy to implement due to their presence on Google Translate.