Closest thing I found with some manual searching was a blog that included an article on Kaprekar and a separate article on Exploratorium. The person seemed to b

Closest thing I found with some manual searching was a blog that included an article on Kaprekar and a separate article on Exploratorium. The person seemed to be involved at some level so it suggested it was feasible, rather than providing evidence. Maybe archive.org would have something. Possibly hallucinaited (sic).