I've thought about that too. I don't think my trekking poles are long enough for that configuration. So, like you have said, if there's no tree available, then the user would have to try to make a pole from available wood. That shouldn't be too hard. Probably want to use two guy lines to steady the pole three dimensionally.
I also own an 8'x10' Siltarp. I've tried half a dozen ways to arrange it into a suitable shelter. None look as good as this.
Look as good? I'll bet not! This one has a pretty young lady smiling at you from the door!