Have you considered Jetpack Compose ? (https://developer.android.com/jetpack/compose) Despite it being a Google project, it also has backing from Jetbrains (https://www.jetbrains.com/lp/compose/). Having access to the full JVM environment of libraries is an infinitely better state than Dart, and Kotlin is also a much more pleasant language. Testing cycle is sliiightly slower, but Compose previews make it easy.
I've been playing with compose and it looks really good. Note that it's still on beta(api should be considered stable) with a release this year. Previews are kinda wonky for now. Sometimes it wouldn't refresh. How hard is it to implement hot reload?
And like I mentioned before, with my low-end laptop its hard to run full Android Studio. Tho Dart's not that pleasant compared to Kotlin, the tooling outside a single IDE was enticing for me.
