Carlton Mixte Project

Why not? You could also use handlebars with a little backsweep like the velo orange porteur or a moustache? Those would look lovely on a mixte.

Thats the plan. I'm still looking for the right bars though. I want something swept back but not so much that the gripping area is 90 degrees to the frame if you know what I mean, hands facing inwards instead of forwards.