I also tried to create a fake druid to apply the Tieru-Druid texture (without affecting the regular druid) and include it in the videos, but it didn't work. The files multiplied, but there was no result, so I gave up. We'll assume that he changes into battle attire from his oratorical outfit and back.
With the Maps_ToE_UnlockAllHeroes mod, the Tieru-Druid model will remain on multiplayer maps.