The people who had the most contacts with the Dutch were flat land Aboriginals. Various Sirayan, Makatau villages, such as Tayouan (Tainan), Mattau (Madou), Tankoya (Kaohsiung), Pangsosia (Linbian) had sustained and mostly friendly interactions with the Dutch. To a lesser degree the Saaroa, Taokas, Babuza, Favorlang, Papora, Hoanya tribes in central Taiwan also had a lot of interactions with the Dutch. After they acquired Northern Taiwan from the Spanish, various Basay and Ketagalan villages probably also had extensive contacts with the Dutch.
Unfortunately, these people and cultures were decimated by Chinese colonialism, from Koxinga to the Qing dynasty. Under harsh discrimination and persecution, the survivors either dispersed to more remote regions or pretended to be Chinese as best they can. Most Pingpu Austronesians were matriarchal societies, that did not have the concept of patriarchal clans, nor did they keep copious notes. So in order to act Chinese, most of them had to make up copious notes for their family clan. Since they had very limited knowledge about China, sometimes there are obvious evidence of fabrication that leaves clues for later generations.
In addition, since they were Matriarchal societies, at one point the Sirayans would openly recruit Han males to marry into their tribes. These Han-ethnic men would eventually take over controls of the tribes, as the social-economical environment around them became predominantly patriarchal.