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Here's the route I did a couple of years with a group of mates, it is a road route, but it does include the avenue vert from Dieppe: https://www.komoot.com/collection/1625109/-london-to-paris-route
My two cents on that section though if you'll indulge me - it's great infrastructure, but isn't gravel and I have to say, I thought it was really boring. 45km of pretty much dead flat stuff with banking on either side most of the way, so no views. Could have been the fact it pissed down the whole way along it though...
PeteJChurchill-
Oh for sure. Def not gravel or pretty exciting, but at 4:30am when it spits you out and you're a bit zombified [I found] it's perfect to smash some ground until you collapse. We rode for about three hours then found a french bar that was open, all had brandies and slept for a couple of hours, the bar owner thought we were hilarious.
Also I don't know your route, but this place we found and stayed at is fucking amazing.
https://goo.gl/maps/aLbSTHBcwrQo4kMc8
photoben
It’s not gravel, but the Avenue Vert is an old railway line converted to a bike lane. It’s great.
Oh and I would recommend the Newhaven-Dieppe ferry. It’s overnight, so you cycle to Newhaven in the day, get a pint and fish & chips whilst you wait, then sleep on the ferry, which spits you out at the bottom of the AV in the middle of the night. Ride that until you find a open boulangerie, and eat as many fresh pain au chocolate as you can…