Steve, As an electrician I cannot tell you what the Sop for the ejection sequene was.See AP4326b pilots notes for B2 etc to clarify the point you mention, unless at the later stages of that mark a mod was brought out to enable jettison through the cockpit canopy, the sequence would have been jettison canopy first. I seem to remember that the rear hatch might have been frangible or at least some of them.
May be the Mk 8 &
PR 9 systems were configured so that pulling the seat handle jettisoned the canopy.