There is a lot of evidence Bamber's route can be cycled. Even today Hardy Boy put up a video of someone cycling The Sea Wall.
But appreciate you want to visit.
I imagine that sea wall you can cycle in the day time without massive difficulty. However difficult you can use your eyes easily in the daylight.
The fact is this defendant was accused of cycling it at 2am and taking tracks and fields to WHF.
Which is a bit different, RB and Bamber say it encountered fields.
Until I go with me not being a local man how can I ascertain either way ?
You yourself said you planned to visit at some point.