Is it possible to make a auto-sexing duck breed

[Duckpond1245]

I currently have some welsh harlequins which are already autosexing. I would love to get some cayuga females to breed with them. Would it be possible in theory after multiple generations to make a auto sexing breed between welsh harlequins and cayugas.

 

[Debbie292d]

There aren't that many breeds of ducks or chickens that are bred together and produce sexed chicks/ducklings. I've read breeds of ducks stemming from mallards can be, but that's still within the same breed. The capability of sexlinking in the Welsh Harlequin would be diluted by breeding with a breed not the same.