He suggested installing plan9port[1], which "just" ports some user land libraries and applications to different Unices, including OS X. So we're talking about native OS X executables here.
There's also the "Acme Stand Alone Complex"[2], which - if I remember correctly - is a "virtual" Inferno OS applet which includes the Acme application.
I'm not exactly agreeing that piping is the end-all, be-all of editor extensibility, but it's certainly worth giving it a try.
There's so much more to Acme than piping.
Actions based on regex matching via the plumber for a start.
Menus you can type / keep in a text file anywhere you like.
No stupid colour syntax highlighting or pointless fancy shit.