I haven't said too much on it since it was posted, but I do agree. Keeping it relatively more simple sounds best.

I do still think a PMD setting would just work out better, but as to story it could be anything. Even something simple as a "small Explorers Festival" or Tournament like setting. Where Exploration Teams from all over the world are gathering in Treasure Town. Where this year's festival was chosen to be hosted. It could somewhat be similar to events like Harry Potter's Goblet of Fire. Except you work with your team to complete challenges.

But to simplify what was posted would really take a lot of tweaking too. I'll need to read back over it a few times too