You don't have to. The levator scapulae inserts into the inferior side of the atlas transverse process. The levator scapulae on the same side might then contract in an attempt to draw the atlas back to a horizontal orientation to re-establish normal weight bearing of the head. Adjustment, using the atlas and head positioning as levers to quick stretch contracted muscles, might then return the rectus capitus lateralis to normal tone causing a relaxation of the levator scapulae and elimination of TrP's. While you are at it please give me the science that LS trigger points are fairly reliable indicators for anything.
All science begins as observation.
Just because a muscle originates from an upper cervical segment does not mean that any upper cervical specific technique is superior to any other technique. I have outlined how the levator scapulae could be involved in and corrected by upper cervical adjusting. Gary A. Knutson, DC Bloomington, IN 1. Simons D. Myofascial pain syndromes of head, neck and low back. Chiropractic management of myofascial and muscular disorders.