To answer the other part of your question: you don’t manually edit the generated Kotlin. Instead there are mechanisms for writing Kotlin inline in your Swift, dropping Kotlin files into the project, and other platform customization options: https://skip.tools/docs/platformcustomization/
The Skip transpiler runs locally on every build. It is implemented as an Xcode build plugin, so it is transparent and instantaneous. Every change you make to the Swift code is immediately converted into Kotlin, so each time you launch the app in the iPhone Simulator, the Android app will launch next to it in the Android Emulator. For a good overview of this process, take a look at: https://skip.tools/tour/skip-showreel/
In other words the Swift app will keep developing, requiring constant Android app generation via transpilation.
Does it keep track of generated and manually edited parts or will that step on each other?