Also this is not clear. Are you talking about a android sdk problem? This doesn’t sound like it has any relationship with KMM.
Connecting your Android project with KMM wouldn’t affect BroadcastChannel in any way, I actually have an example laying around.
If you are talking about triggering this from the common/shared code: In my opinion which is someone that never did this from common, it sounds like a AndroidSDK specific thing and I would just do it in the Android side of your project.