(Copied from a sibling comment of mine): look at this site: https://sourdo.com/ https://sourdo.com/ Ed Wood did more or less the same thing in the 90s, it was

(Copied from a sibling comment of mine): look at this site: https://sourdo.com/ https://sourdo.com/ Ed Wood did more or less the same thing in the 90s, it was covered in Nat Geo in Jan 1995. He sells the sourdough culture he got in Egypt.