yep I have pure canadas myself and never had issues. I do have the papers needed for them though. I just cant sell their babies yet until I get a sale and disposal permit. its basically just to keep track of who breeds them and sells them.
and I am super excited to see what they will look like as well. my toulouse has been mating with my canada male and laying eggs i put a few of hers in the incubator and they are growing so crossing my fingers on a good hatch. but I know they will not be as cool as a seb cross. thats for sure.
I have a slight fascination with waterfowl crosses. and want to collect them for my aviary. the only issue is for some reason waterfowl breeders for ducks get all huffy about it they yell at each other. or they gang up on the person who is trying to sell the crosses. look up duck or waterfowl hybrids they all look amazing who wouldn't pay for one. I can see not wanting one that is sterile but ducks wont be sterile. only domestic /wild crosses.