The people in the photo are Pangcah singer Suming and his family. They are at Guam attending the Festival of Pacific Arts. They later said the flag is a flag for Pangcah. Although I have to say it’s the first time I’ve seen it. The star I think is made up of 6 rhombus shaped matas. I saw that decoration on walls the last time I visited Dulan.
Back to designing new flags that can be adopted without amending the ROC constitution, i.e. “red earth with blue sky and white sun in the top left canton”, I offer you two solutions: