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The other avenue is adding a Rust frontend to GCC

This is false equivalency.

Rustc's lack of architecture support is purely an LLVM issue/

A far as I know, the latter supports many architectures the former does not.

It is true that Rust supports a subset of the architectures LLVM supports, but to be honest, I am not sure if "many" is the right adjective. I mean that in a literal sense, I don't have a good handle on the list. For Rust, the list is https://doc.rust-lang.org/nightly/rustc/platform-support.htm..., but I'm not sure if there's such a list for LLVM, other than looking at something like https://llvm.org/doxygen/Triple_8h_source.html and figuring it out?