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I think that's more or less the route we did. Over 2 days. We extended it a bit so rather than taking the direct route back to Ryde on day 2, we did more in the middle and hugged the east coast after that.
One of us did it on a gravel bike. Although he was complaining about some of the bumpier surfaces by the end.
Having ridden the road loop too, I'd choose the off road option 10 times out of 10. Unless it's wet.
I can give you two as it happens. I haven't ridden either but the first one has been ridden by mates and they really enjoyed it
https://www.strava.com/routes/2838371822397013268
and the second is from this interesting & in-depth accompanying article
https://www.strava.com/routes/2838396719061089990