@sxa Well, the same problem exists on BSD userlands aswell. For example, FreeBSD's csh and OpenBSD's ksh both provide non-POSIX extensions, as do many of their utilities.
I'm going to maintain an as-is version of these utils, merely ported to compile and run properly, but then maintain a branch in parallel that removes non-POSIX features, bringing feature parity with busybox.
What I want is a single-binary setup like busybox, but with openbsd code in it.