People don't really buy RISCV at all at this point, there's noting less compatible you could get if you tried.

isn't there box64 that can run x64 applications?

And I think a language like golang can be a really really nice fit given how it can be compiled really fast towards risc-v as well

Maybe java also runs in risc-v I am not sure, surely people are working on java support I suppose.

People buy risc-v to support an open standard and to not worry about licensing fees.

Isro (india's nasa basically) uses some risc-v chips to not license arm chips etc. because of either better national security (to have less arm influence) or because they don't want licensing fees given how rudiculously price efficient isro is.