Dostałem odpowiedź od Bruno :D (pozwolę sobie zacytować fragment):

Bruno napisał/a:

You have noticed - in the libiconv/NOTES file - that there has to be a
justification for adding an encoding to the official libiconv. Millions of
users pay with their disk space and RAM for it. "Quite useful in crossworking
on retro 8-bit Atari XL/XE machines" is not an adequate justification, since
probably less than 10 people in the world are interested in doing this.

Ale mogę sobie to redystrybuować w dowolnej postaci.