[throwaway87378]

> However, we also know that the difficulties of typing these languages without special keyboard support have led to a variety of more English in ASCII language successors such as J/K/L.

The input language has nothing to do with the keyboard. How do you think people type foreign natural languages? This comes up again and again in programming-related online discussions - why is it so hard for people who program software every day to imagine that keyboard input is also mapped by software?

The real reason Iverson used ASCII for J is that in the early 1980s, you had to get an APL character video ROM (code page 907) for your terminal or PC (exactly the same case as for foreign languages). Obviously not a problem at the time for Macs or other computers that use bit-mapped fonts, and has not been a problem for PCs for the past 30 years.