So, if E Phrygian was the main focus through most of the progression, then changing to B Phrygian over the Bm would also work well because it shares 6 of the 7 notes with E and only changes the F to F#. Everything else remains in key and the slight shift to F# could also be incorporated into a "Blue Note"
if desired.
Great Lesson, Thank you C.
Now, if I could only get your input to the "Confirmation Thread" question.