I would not be afraid to try either in a no spray orchard. Black Amish is the most beautiful of the black apples we grow. I don’t recall FB on the Black Amish mature trees but did see a couple strikes on BA the nursery (laid down a ton of manure) Swiss had great flavor this year and I have not noticed any Disease issues with Swiss. I continue to slowly document information on varieties as I find time: Apple Database.xlsx - Google Sheets
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Not sure how many permaculture folks are interested but there might be another approach worth trying if the methods that you have read about, or experts say to do isnt working.
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