Working the tides, you could drop down to Ramsgate, stop there for a night, and then over to Ostend, bypassing Calais.
We've just done this, and it's a pleasant sail ( see my post on the East Coast forum ).
You mention cruising speed of 5 knots for a 35 footer, is that correct? We have a 36...
My wife walked aboard and said, "we're buying this". I suggested maybe a survey? check the sails etc? Eventually she capitulated and after she let me check everything, we bought the boat.
( full disclosure, it was the boat I wanted, so win-win )
I thought it was you lot, but I didn't want to ask a bunch of distinguished members of society which one was the old git :ROFLMAO:
Pass on our thanks to the owners of the Broom 37 that made a nice wind break for us as we moored up (y)