Rust has an experimental C backend of its own as part of rustc_codegen_clr https://github.com/FractalFir/rustc_codegen_clr . Would probably work better than trying to transpile C from general LLVM IR.

Some people have demonstrated portability using the WASM target, translating that to C89 via w2c2, and then compiling _that_ for the final target.

Given that the maintainer previously said they had tried to pay to get GCC and LLVM ported multiple times, all of which failed, money doesn’t seem to have helped.

Surely the question is how much they tried to pay? Clearly the answer is "not enough".

I mean at one point I had LLVM targeting Xbox 360, PS3, and Wii so I'm sure it's possible, it just needs some imagination and elbow grease :)