Eureka Rebel John Joseph is buried in my region, i'll be flying a Eureka and some sort of anti-slavery or black separatist flag at his grave. Ideas?

https://en.wikipedia.org/wiki/John_Joseph_(rebel))

He was an escaped slave who came to Aus to mine gold and then joined the Rebels.

The yanks came and "honoured him" recently and stamped his grave with an American flag and seal. I wanna honour him by flying the flag he and his brothers from many nations fought under, and also something that represents his struggle in America. Any ideas?