A good topic to review. I like your plan Jay! A couple of thoughts from my experience in 40-45 knot squalls:
1)It seems like a lack of hatch boards can lead to the most catastrophic outcome. Are the boards in an easy to reach place? I think I need to reconsider where I keep the vertical slat, it's often sliding around down below.
2) I don't think you need to get the jib out. My experience is that you pick-up plenty of speed to quarter the waves with just a bare pole. Furthermore, once the jib is un-furled in that much wind, you will have to douse it if you need to take it down. It won't furl in that much wind. As a mater of fact it's tough to keep it furled in that much wind without wrapping the spinnaker halyard around it.
Mark A told me when they got hit by the squall at NA's in Sarnia, they dropped the jib and stowed it. Then used a small amount of main sail pulled up and laid over the boom to get some speed and steerage to sail back to the marina.