There's a post in the IBD group about Stella & Chewy coming out with a new, boneless, version of their frozen raw. It will be medallions instead of nuggets I think. They posted a picture of what will be the packaging, but I in the ingredients list I didn't see a calcium source listed, not sure what S&C plan to use. the person who posted it works for an independent pet health food store, is how they know about it.
Queen Eva still gets a little S&C every week. Usually one meal of Duck Duck Goose on Wednesday week and one meal of Rabbit on Sunday. Any more than that and she gets a bit constipated, it's too high in bone.