Correct, please don't try to recover the meat from this bird. Good advice on using the vacuum sealer, just make sure the duck is frozen before you vacuum-seal it, and make sure you don't thaw it while under vacuum. It will draw the blood out of the bird, and make it more difficult to remove the blood during the mounting process. First duck was a Woodie? That's a trophy that eludes alot veterans. Congratulations!
I hate to say this, but if you are getting it mounted, I wouldn't worry about the two small nuggets of meat you'll recover, if you decided to breast it out yourself. The Taxidermist makes a relatively small inscision when he skins your bird, and if you REALLY wanted it, he might give it to you. I wouldn't worry about waste at this point. Once it goes to the Taxidermist, that rule becomes null and void.