I don’t think they do other than at official events i.e. EA Global. I’m not sure who “owns” the EA logo but technically you could make your own shirt. I found a few more here on RedBubble, and this article on ea merchandise may have some links buried in it. Otherwise, I would suggest reaching out to CEA directly to ask.
(also...thanks for introducing me to the word shonky—I’ll be using it now!)
pretty sure you are talking about the interview with Dr. Nick Beckstead. https://80000hours.org/podcast/episodes/nick-beckstead-giving-billions/#transcript
Just search the page (command key + F) for the number “2000” to find that part of the conversation.