> Like, using a language that can compile to JVM byte codes to integrate with existing code bases, yet can also be compiled into native code on x86/64 and ARM/6

> Like, using a language that can compile to JVM byte codes to integrate with existing code bases, yet can also be compiled into native code on x86/64 and ARM/64 for linking against? Any language supported by GraalVM (https://www.graalvm.org/ https://www.graalvm.org/) should be able to do this (including Java).