The plum sauce will make the duck sweet and the honey glaze on the veggies will make them sweet.what are the 2 sweet things
You're going to have two sweet items on the same plate. That could be overpowering.
I would also consider serving with some kind of small but refreshing salad - maybe shredded cucumber or similar.
Duck breast with reduced plum sauce / red wine sauce.
wasabi mash
oven roasted veg glazed with honey /olive oil