VincEd also supports the xterm colours, if you're looking to reproduce this on vanilla 68k AmigaOS as well. KingCon AFAIK does not. (One of the reasons I preferred VincEd to KingCon, but it seems I was in a minority.)

VincEd may work on OS4 as well, if its console doesn't support xterm colours (which it might, I have no idea). VincEd works on MorphOS, though it hangs if you try to use the GUI preferences. You must edit prefs by hand. Possibly the same will be true on OS4.