"Big chunks of American cities are built on man-made land that is a climate catastrophe waiting to happen"
I live in Somerset, UK. Just north of where I live is the "Somerset Levels". About 400 years ago a bunch of cloggies (Dutchmen) were engaged to drain the marginal lands for farm land etc. King's Sedgemoor Drain was built later etc. This is the land of Glastonbury (the festival actually happens at a farm in Pilton).
The Neths have centuries of experience of dealing with marginal lands. Your swamps are not going to faze them any more than ours.