I expect the os to be fully based around and r7rs loaded racket erlang and R.

When RISC-V inevitably renames itself CISC-V, then what language would naturally fit together?

And don't say cobol.

Ceylon?[1]

Crystal?[2]

Church?[3]

Coq?[4]

[1]: https://ceylon-lang.org/

[2]: https://crystal-lang.org/

[3]: https://en.wikipedia.org/wiki/Church_(programming_language)

[4]: https://en.wikipedia.org/wiki/Coq

COMTRAN would be a way better choice than COBOL :-) (https://en.wikipedia.org/wiki/COMTRAN)

Common Lisp would be a decent choice, too, with

    CISC:RISC = Common Lisp:Scheme

C++?

Obviously: Clojure.

Why nor CRISC-V? Or CaRISC-V? Or (eww) RaCISC-V?

It's not like current "CISC" architectures haven't taken a lot of the good aspects of RISC already too...

Well it would be "less risk", maybe even "riskless" so I guess you'd need a new language named "restless"?

V

https://vlang.io/

You could vlog about it.

Cython with a rust core?

C

Worse is better, forever.

"Because I wanted to" should be reason enough. But for those who demand a better justification, this is very specific ;-)