Damned expensive, but check with Dr Ambrose down at the WWII D Day Museum. Kansas State History Department is excellent tour too. Dunno if Dr. Wilson at KU is still doing them. I'd do one, but have small kids. If you want to see "hedgerow hell" you have to go NE of Normandy. Lots of little museums off the beaten path. You have to see the Ossuary at Verdun, Bastone AB museum if you make it that far, Bayeux Tapestry and museums in Caen, Beaches at Verville, Ponte Du Hoc, etc. You could spend a month there.
IF it weren't for the damn Mooselimbs, I'd love to do a bicycle tour. Lots of petty crime in Calais, Caen, and cities over 10k. (Priest beheaded recently in NOrmandy)