How strictly do you mean “UNIX clone”? Because Linux isn’t strictly UNIX. But then at the other end of the scale, BeOS was also partially POSIX compliant and shipped with Bash plenty of UNIX CLI tools.

Perhaps it’s better to play it safe and just run DOS instead ;)

It certainly is, what it is not, is a derivative.

BeOS on its final commercial version certainly did not allow to compile UNIX applications, beyond the common surface that is part of ISO C and ISO C++ standard library.