The biggest Guru of the Saemisch is probably GM Daniel King.
It sounds like you are looking to play it as White. Quality Chess has a 2 book set on Playing 1.d4. The first is on 1...d5, the second on Indian Defenses. The second chapter of the one on Indian Defenses is the King's Indian Defense, and the line he covers is the line you are referring to, the Be3-Saemisch.
You might find a few other ideas as well. I don't own those two books, but if I remember right, I believe he covers 4.e3 in the Nimzo-Indian, 5.f3 against the Benko Gambit, not sure if he gives Classical, Modern (7.h3) or Flick Knife Attack against the Benoni, and I think the Russian System against the Grunfeld, but I can't swear to that one. I know for certain however that his recommendation against the KID is indeed the Saemisch!
Greetings all, I've waffled around quite a lot with my KID repertoire over the last few years - starting with the classical setup (with white I usually start with whatever is considered THE main line and deviate later), then an Averbach, then a Saemisch with Bg5. The pin can be very powerful, and I've grabbed an h6 pawn countless times in blitz (after Qd2)....but I've been starting to feel like I've really outgrown this offbeat Saemisch/Averbach hybrid - like I should just be playing the big girl Saemisch with Be3.
Who here plays the mainline Saemisch? Which professional players are the greatest experts on the subject? What are some of the best games in the Saemisch? Tell me war stories!