Any chance of adding this menu entry into the Usenapp editor pane menus? As seen in Textedit and sundry other apps, also on ctrl-cmd-space. I'm assuming it's a system provided feature as long as you're using the frameworks that support it 😁
Now I've suddenly got a UTF-8/Unicode clean usenet client after 20 years of one that supported 8 bit ascii codepages, a little judicious use of fancy symbols seems reasonable!