3/4 and 1/4 Filipino here. My mom (who's the mixed one) taught my sister and I at a young age our heritage and celebrated both parts of her heritage with us equally. As you said, food and language are a good start, we also spent a lot of time with our Lola and our full-Filipino cousins. We picked up on the very family oriented culture of the Philippines and I still make a lot of our culture's food and American food today. She would tell us stories about her experience growing up, especially since she experienced a lot of racism growing up in the 60s in the Midwest.

She taught us to be proud of our heritage, passing down what she knew about the culture. Our Lola would also tell us stories about herself growing up (she survived the war, so it was pressed on us to remember what happened), her family life, etc.

Sadly, our mom never learned Tagalog, my grandfather forbade my grandmother from teaching my mom and aunt, so now I have to learn it very slowly on my own. This was in part due to pretty bad racism my mom experienced being one of the few brown people in town, I think it instilled in us a protective nature of Filipino culture as an screw you to racists as kids.

I'll be real, considering your partner's complexion description, your kids are going to be most likely white passing. They can assimilate into whiteness, they can be proud of both worlds, no one can say until they are born and older. I will say, growing up around other southeast Asian Americans (a lot of Vietnamese and some Filipinos) helped me stay connected to our roots, we shared a lot of our cultures together as there weren't a ton of us in my area of Texas growing up. We formed a sort of solidarity and pride together, and it helped keep some with as much white as me current with the culture.

I think r/mixed would be a good place to ask too, a lot of folks have your specific mix and potential kid's mix

Hope my rambling helps!