John, what you need is a duck skiff. Once, the primary ways to hunt the numerous river and creeks of Wisconsin, they are now used primarily in marshes, as they do well getting thru vegetation.
A friend of mine, Ron Koch, only hunts this way and is one of the most successful hunters I know. This style of hunting produces even when there are few ducks.
Ron drifts down stream, his gun always at the ready, while poised in the Poygan shell box rack. When he wants a break, he simply backs into cover, throws out a few decoys, and enjoys a cup of coffee or a sandwich. To return he either uses a small kicker or has some retired duck hunter pick him up. He knows the time it takes to float from bridge to bridge, and can always plan for someone to pick him up. He also never hunts before 9:00. This is type of hunting is best midday.
A skiff will be stable for shooting and using a retriever because of the low center of gravity. They are also good for fishing and trapping. Precision Sports in Oshkosh, Wisconsin, phone number 920-233-2274 has several great skiffs they make and are fairly reasonable cost wise. Also you can build one. Pete McMiller made one last year and is making another this year. Pete will be glad to help you on this site.