Steve,
Vic Farmer is planning on departing Newport early in the am on Monday 2 August to meet up with the group in Marion. Newport to Marion is about 40 nm and pretty much along the way. There are more facilities available in Marion than Cuttyhunk, so that's why we've elected to stop there. (e.g. showers).
Our Vineyard leg is part of a planned family cruise, and it would be a little out of the way for you if you are trying to minimize time and distance.
Let me know if you want to join up with the group in Marion. Vic could probably find you a spot to meet you in Newport if you want to stop there along the way.