Don’t worry, I think most LLMs, when starting a greenfield codebase, don’t reach for Java, so it may be a smaller amount of code affected than you feared.
Prompt: “Top language pick for an Android app? Respond with only the language.”
Responses (admittedly via the aichat CLI, not an agent harness; and temp=0):
Kimi K3: Kotlin
GPT 5.6 Sol: Kotlin
Claude Fable 5: Kotlin
DeepSeek v4 Flash 0731: Kotlin
Are there any other “inherently” heavily JVM-biased domains?
I think even in Minecraft game mods Kotlin is possible nowadays…