I just got back from ShireCon 2021, where my latest addendum to T1-4 The Temple of Elemental Evil debuted. I had a good group of players, including Jeffrey Talanian of Hyperborea fame, but alas the game ended in a TPK. But perhaps your own players will have a different experience as they make their way from Narwell to the Village of Hommlet, and this module will let them do just that.
The concept of the module is that the PCs will have an opportunity to learn about the various factions active in the Temple, and get them used to the general idea that they can work them against each other.
You can download the file here. Enjoy!
Update (9/20/21): The file has been updated to correct an (important) typo. Please download the new version.