The reverse -- building for iOS in Kotlin -- is an interesting option that on the surface appears to be a best of both worlds.

You get (1) access to JVM APIs as normal on Android, and (2) Fairly full-featured interop with ObjC, Swift and C APIs elsewhere, and (3) A pleasant language with excellent IDE support in IntelliJ.

The `expect fun` / `actual fun` stubbing for different platforms also works in a fairly low-drama way. You can also share UI with Compose Multiplatform (less mature), or just write native views.

The downside (of course) is that non-JVM targets like iOS can't use the JVM ecosystem, and most of the Kotlin ecosystem assumes Kotlin/JVM. This is slowly changing though, and isn't a structural flaw.

Also, you're going to end up with Gradle in your toolchain, which will torture your poor soul.