If you could bear to ride the cycle path (which I think is on the pavement, isn't it?) from Arlesey Station/Henlow Bridge Lakes to Shefford along the A507, I believe you can pick up the Bunyan Trail to Bedford from Shefford. Never done it myself, but wouldn't mind e-biking out that way to check it out one day. https://www.britishpilgrimage.org/portfolio/john-bunyan-trail