Looking for a larger Mixte frame or complete bike but really the frame is the important part. 54-56mm seat tube height.
Or the Rolls Royce of Mixtes....the Cheviot!
And Marc, awesome Buena Vista!
For a while Raleigh had a lovely road-oriented mixte. You might find one of these used. I was considering it because it was one of the few mixtes I could find that was available in larger frame sizes. (I'm 6'1" with long legs, and they had frames big enough for me.)
For a local handbuilt option, check out Legacy Frameworks in Bridgeport.