Hey, it's always good to learn people are interested in SEA. And I appreciate that you went through efforts of learning more. But there's also a wealth of information available out there, and unfortunately .gov and Wikipedia article don't reflect this depth much. For example, as you may know, in...
"Suvarnabhumi--the ancient golden age of SEA"
"Indonesians, Malaysians, and even Filipinos also identify with Suvarnabhumi."
no? If you want to use a real kingdom and not a mythic, exotic "land of gold" toponym, Majapahit might be a closer match.