Good Post.
Pelvic pain can come from Myofascial trigger points as you mentioned. Not only from the vaginal muscles but may also result from abdominal, leg adductor, glutes and paraspinal muscles.

Men can also have pelvic and Rock pain secondary to the same muscles "less the vaginal muscles".

Most PTs are not trained extensivly in in myofascial realease techniques. This training is usually post graduate CEU's in the form of workshops.

There is a group that trains 500 plus hours in this type of release called Myofascial trigger point therapist. Myofascial Trigger points are not usually PTs but can be. You can locate a Myofascial Trigger Point Therapist at the National association of Myofascial Trigger Point therapist.