It's extremely interesting. I do have a suggestion to make sure the question are not in training data:

If this game show is like the ones in my country, people do come together in 'clubs' to train for the event, sometimes organising internal tournaments. Some people in those clubs are question-writers, and write the internal tournaments questions.

Maybe try to contact those clubs, and find those writers, you'll be sure the LLM won't be trained on that specific set.

Very good point and a great idea. I think there would be value in such an archive that is not reshared for AI training. Very time consuming to build up though.