Some interesting projects

[mipastgt]

I don't know whether you are aware of the following projects. Therefore I just send you the links. They indirectly do something very similar to what you are doing. So, maybe there is something you can learn or even borrow from them.

1. Chicory: Native JVM WebAssembly runtime
   https://chicory.dev/docs/usage/build-time-compiler
   https://github.com/dylibso/chicory

Chicory is actually a runtime for WebAssembly completely written in Java. They have something they call a build-time-compiler which transpiles the WASM code into Java class files. Compiling Rust to WASM is already very well supported. So, basically they are just using a different intermediate format but the result is the same.

2. wasi-emscripten-host: Kotlin Multiplatform Implementation of WASI Preview 1 and Emscripten host functions
   https://github.com/illarionov/wasi-emscripten-host

3. wasm2class-gradle-plugin: Compiles .wasm into .class for running on the JVM
   https://github.com/illarionov/wasm2class-gradle-plugin

This might give you a few ideas and maybe even some code to implement the Rust core and std functionality.

I don't know whether this helps but I just wanted to let you know about it so that you can decide yourself.