I realize that but having one visible lavender is a start if only so her babies will carry it and I can expand it out into my future flock. I have a link to a Muscovy genetic calculator. It has taught me a lot. It seems that recognizing the colors may be the most difficult part of this for me.
I used to breed lovebirds and they have many sex linked colors as well as recessive genes that require two copies to be visible. So I have a base knowledge of how it works due to having them.