Why would they discontinue a classic set like that? I'm too new to the hobby to have ever seen one before and would have loved to make some of those for my pencil users.
The ballpoint has not been discontinued. As I mentioned above, the ballpoint refill (parker style) can be replaced with a schmidt pencil mechanism. I actually replaced the pencil mechanism with a parker style ballpoint refill and spring and it worked flawlessly. So, If you want to pursue this then purchase a ballpoint kit and a schmidt pencil mechanism and you will be good to go. Only drawback is the pencil will not have an eraser under the cap. Exotixblanks.com sells the jr gent ballpoint and the schmidt pencil mechanism.
Do a good turn daily!
Don
caveat: The conversion works with the ballpoint kit I have which is at least 10 yrs old. Hopefully, the ballpoint kit has not changed. It looks the same online as the one I just made.