Aaron Hardin

Willow trees are very resilient and can be cut back fairly extremely each year. My recommendation (without seeing pictures, sun charts, etc.) is to cut it back to where it is manageable and harvest each year for copacing and the beautiful wattle fencing.

Ducks don't have as strict a pecking order as chickens. So it may be adopted fairly easily. Ducks can't bite very hard, but a tiny neck doesn't take much, and they can be rather mean especially around mating season.

If the ducks are the laziest way to get food, they will find a way. Electric poultry netting is an option, we put ours away in an A-frame coop I made every night.
Solution could be as simple as putting some dogfood/catfood out so the racoon has an easier meal, removing all food sources from enclosure. Racoon traps are relatively cheap and can sometimes be rented. Some companies will relocate raccoons (we have about 100 on our property so not an option).

Ducks are rather dumb. I had one of mine (peeking duck) nearly walk over a mosquito torch I had next to where I was working. You will need some kind of deterrent to keep them away from the property line. Non-functional poultry netting is a good option and large enough not to be mistook for a fishing net. If you train the ducks to associate the orange poultry net with boundary, any orange resemblance can work, including orange rope.
The fiberglass stomp posts are ~$2.50 USD depending on where you are and can be easily pulled down and moved. The electric poultry netting in general is an amazing investment for rotating birds into beds and keeping pests out. Amazon has a few options ~$250 for a good set with solar box. Make sure you disconnect the bottom row or two so the grass doesn't short the circuit.