I'd be interested to see the links to the ones you are referring too.
But it's a great way idea for a trip! Just go do it, yourself if you have to. Read up in advance, or take some audiobooks for the road.
Not too highbrow - plenty of calvados and cider - last year I did a 'William The Conquorer tour' - basically a 4day loop around Normandy, taking in his court at Caen, birthplace at Fallise, and ofc Bayeaux. All well worth seeing in themselves, not matter how deep your interest in the subject is. tbh the Hastings site itself makes a great day trip on a bike - you loop about 45 miles to take everything in from the landing site at Pevensey, to Hastlings, to the actualy battlefield on Senlac Hill.
But whatever floats your boat, like growingvegatbles says the possibilities are really endless.