I have the phone 2a plus, and I managed to FULLY get essential search working, and YES, with the Easter eggs and AI.
So I deleted nothing launcher updates, installed essential search 1.0.2 trough APK, and updated to launcher 3.3.10 wich seems to be the best version so far, and then it worked simply.
Keep in mind that deleting app updates/downgrading deletes app data meaning you will need to rearrange your layout again.