I take you point, though it is perfectly possible to have two to three good days out in northern France, the roads are just 'different'.
The problem is that the OP wants to ride for two to three hours, get to his hotel, unpack and then go out hooning in the afternoon. If we assume that he's prepared to motorway for two to three hours, that will get him no further than Troyes.
https://maps.google.co.uk/maps?oe=U...&sa=X&ei=yMevU461EIXVOd60gegK&ved=0CC4Q-A8wAA
If he is prepared to push on a bit further, then I'd suggest he heads for Avallon. He could then spend all the next day riding in the Morvan, which is definitely far from shabby. If he is prepared to forego his afternoon ride on day one, he could ride the start of the journey to Avallon on the motorway, say to St Pol or St Quentin and then cut across country, to arrive in Avallon in the mid-to-late afternoon, for sure.
That idea would kill two birds with one stone as he'd still get his afternoon ride down 'better' roads and would be better placed for the next day. The map linked to above is useful perhaps, as it shows about the furthest motorway distance he'll get in three and a half hours from Calais. If he (or anyone else) prescribes an ark of the same distance from Calais, the outer edge will be the limit of where he'll get to using motorways / fast roads and be arriving at his two night stop hotel in any hope of going out in the afternoon. This of course assumes that he's not trundling off the Chunnel or ferry at noon....
Now he's got the map / distance in mind, let's play 'Swing the arc'...
Verdun works. You can go near enough all the way on the motorway and be there for lunch.... Or go across country all the way and be there for early tea.
St Menehould, the same.
Sedan is a goer. It's not as far in miles but you lose the motorway at Cambrai or just north of Rheims, so I have shortened it.
https://maps.google.co.uk/maps?oe=U...&sa=X&ei=yMevU461EIXVOd60gegK&ved=0CC4Q-A8wAA
Dinant too.....
https://maps.google.co.uk/maps?clie...&sa=X&ei=4M6vU_zjNIWOOMungJgF&ved=0CB8Q-A8wAA
If he is prepared to ride for the bulk of the day, some on motorway and some down some decent N and D roads, he could get to Clervaux or Vianden, no problem. If he is prepared to get his skates on, he could do the same all the way to Dijon, for sure.
If he is prepared to ride all day down a motorway, he could get to Marseille, without a doubt...
https://maps.google.co.uk/maps?clie...&sa=X&ei=4M6vU_zjNIWOOMungJgF&ved=0CB8Q-A8wAA
All these suggestions do little other than prove that all and any options are open to the bod and his mates, depending on what THEY really want to do. After all, they know where the B500 and the 'ring are, how they got there and when. Everything else will be a stroll in the park. They'll work it out, I'm sure.