It will take several generations to get that pattern and remove the wheaten genes. That is going to be an uphill fight. Then you would have egg color issues and feathered legs and then there is the yellow skin vs white skin..... That cross would be a hard one to get over to the Ams side. I would pick something with fewer issues. If I was going to do it I would start with black ams not wheaten. There are other breeds that are Blue partridge. I have Blue partridge rocks I created from crossing blue rocks and partridge rocks. Took a long time to get that pattern back. Luckily I didn't have other issues to worry about.
Thanks! I am actually getting a black ameraucana rooster to breed with my lavenders. This is just backyard fun... I will do more research and keep Yall updated!