It is unrealistic right now. I think that it will become common as it becomes easier. As nostr:nprofile1qyxhwumn8ghj7mn0wvhxcmmvqywhwumn8ghj7mn0wd68yttsw43zuam9d3kx7unyv4ezumn9wsqzpclca3vtuwz4ypdjx9ywcceuzs7yka76rh23wrjvurdv9r4zwremdamxjf mentions, there are products that can do it now. There is also an increasing need for other features these products provide, such as private communication and file servers (and possibly AI one day.) Within a few years, it will be possible to buy an inexpensive, secure, plug and play personal bank.