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Go (AKA Golang) has been famous for its portability. The docs seem to indicate Go has had AIX support since version 1.12 [0]. I haven't used it personally, though, so I don't know how good it is.

[0] https://go.dev/blog/ports

AIX... you're bringing back bad memories of running xlc on a AIX 4.3.3 system, back in the early 2000's.

Somehow I had more fun coding on Aix than HP-UX, even though I used HP-UX longer.

AIX is a pretty decent Unix, all things considered. It had a ton of proprietary configuration, but "smit" made it super easy to administer. I was briefly a sysadmin of an HP-UX environment, and it was not fun.

Nim, Haskell, OCaml (bytecode only I believe, unfortunately), D perhaps, and Go (AIX 7.2+) are not bad options, depending on your needs and taste.

I'm hoping mrustc or the gcc frontend become viable too.