Wanted cold hardy Dooryard Avocado

[kingoceanos]

Are there any types that are non- commercial and cold hardy. Just me and my wife to feed so I don't need huge yields, just good quality. Most commercially available cold hardy types have poor taste and texture, we are wanting something close to or better than a California hass but has to be able to handle our colder temps here in zone 8b. Of course it will be protected while small and planted next to a south facing wall, but will have to able to handle the cold when large. Looking for scions.
Thanks

I currently have a couple of Mexican unknowns from a friend in California, Bonny Doon, GreenGold, Stewart,Brogdon, Bacon, Gwen and some seedling Bonny Doons.