Not going to be able to join you for this but did want to look at the route. Unfortunately it's private. Can you change the access so I can see where you are going?
Can't make as I'm heading to the "other" cape for the weekend. Many years ago I did a ride from Sudbury to Gloucester and used the same coastal road from Beverly to Gloucester. I remember Manchester-by-the-Sea being a nice area to ride through. But I also recall that crossing I-95 on Rt. 62 was a cyclist's nightmare, so be careful out there! Hope you get some company.