Observation one: It’s a long way from Ypres to the Normandy beaches. In short, roughly 500 kms or 300 miles. That’s going direct, too.
Observation two: The D-day beaches themselves are about 100 miles wide east to west.
Observation three: Much better to decide on one or the other.
Observation four: You are asking for routes (presumably from and back to Calais) and hotels / B&B’s / campsites. Which is most important tp you? Routes or places to stay for your five days?
Observation five: If I were starting / ending in Calais, having trundled off the Chunnel, I’d probably concentrate on the WW1 ‘stuff’ plus, say the Dunkirk cemetery and finish up somewhere around Peronne, with iits excellent museum. In very simple terms, once you have ‘Done Ypres’ you’ll be near enough following the line of the motorway down, past Cambrai, Albert to Peronne. Pick your WW1 ‘stuff’ from there.
You might find this handy:
https://www.cwgc.org/our-work/blog/...efields-exploring-the-heart-of-the-great-war/
PS Outside of Dunkirk cemetery (largely ignored on these pages) the main WW2 ‘stuff’ in the NE of France / Flanders / Somme are the V weapon sites, up near Calais.
PPS Usual question: Is the five days:
A. Calais to Calais, or
B. Your front door to your front door, your house being five hours from Folkestone