We have a route through NL - based on an old midsummer 1000 - but a link to Amsterdam woiuld be great - appreciate that allroad tracks get very limted in the west of the country though.
In France we have a route from calais/dieppe to perpignan and the Pyrenees but it's a bit boring in the north and I was thinking of trying to create something down the eastern side of France ideally to the Jura and alps before looping west back towards Perpignan. I know the Alps can be tricky. I remeber a chap near Liege who used to advertise under road.be had a multiday route from the Ardennes to Geneva but can't find any evidence he's still going.
Finland and the baltics are sussed though there is a gap from there to Greece. balkans is getting sorted as is Italy. An Italy - Perignan rouet, as mentioned abovem, would be graet. Spain and portugal sorted. UK sorted belgium - I've an old route - bit of Ad's and a bit from others. Any update on legalities would be graet as I gather the belgiques are getting a bit ecowarrior