I’ve only ever heard a gamelan orchestra, in person, in two contexts.
The main one is universities. It’s taught, reverently, to western performers. I was one myself, a million years ago. The professor was very much Indonesian, and had basically made it his life’s mission to share as much of his culture as he could with us ungrateful kids.
The other context is at maker faires. There’s a guy who’s collected all the instruments and rigged them up with arduino-driven servos. He improvises on the whole ensemble by launching scenes in his Ableton set. It’s very cool. I’m all kinds of jealous.
In either of these cases, though, you’re looking at someone who’s studied the patterns and musical idioms, and is much closer to cultural appropriation than someone who just likes the sounds, I think. Because the gamelan isn’t just a set of instruments. It’s a musical framework. And that’s where the culture is.
Hitting things with sticks is sort of universal. Y’know? I wouldn’t feel bad about borrowing that.