I would absolutely have done that if I had TO status but I don't yet despite my recent request. As soon as I'm upped to the TO status I'll be posting further announcements here.
The reason we restrict access to the Tournament Announcement forum is to ensure that only people screened by the staff can post announcements. That helps us avoid problems like
this or
this which arise from bad TO's. If we're taking too long to promote you, the proper course of action is to PM one of us and ask us to act faster, not circumvent the system by posting announcements in other forums without TO status.