Hello Richard,
at www.akvz.de you'll find a databank of the Schleswig-Holstein censuses. In 1803, there is a Christian Bliesemer in Dahme, having several children, one of them named Christian Fridrich Gottlib Bliesemer, aged 7, and so in 1825 about 29 years old. Maybe he's the father of your Marcus Casper Bliesemer, and so the missing link.
Best wishes,
Thomas