My Father thought that since we cooking ducks...............
it would appropriate to use, ( are you ready for this)..........
Donald Duck concentrate Orange Juice along with 2-3 cups of dark brown sugar, in a large pitcher.

The ducks were cut in half with the skin on and placed in a large Tupperware container and other spices could be added, if needed.

Before thinning with water, you can save some thick mixture (1/4 cup)for basting the final product, just before serving, as an option.

This is the basic brine w/o any other seasons..........
but feel free to add more.