Hi, I'm Eythana, author of the article. A corpus is currently being built! Lots of Amish are actually okay with audio recordings, and there are tons of formerly Amish who contribute too. Rose Fisher at Michigan State is creating it. We're both interested and slowly working on familiarizing speakers with the orthographies that do actually exist (BBB is our preferred one). They've just been floating around in niche and/or academic crevices and most people don't know about them. Rose has great info on her site here https://penndutchdialects.org/pennsylvania-dutch-isnt-a-writ...