King's Indian Defense Counter(s)

I have an upcoming tournament game against an opponent who I know well and play against often, so I am aware he begins every game as black with 1.d6 2. g6 3. Bg7. This is not ignorance of theory on his part, rather he swears by the system and feels comfortable traversing from this position every game. He intends to play a standard King's Indian Defense where white grabs space while black looks for counter-play, but I should think knowing his first three moves gives white a clear advantage. I have looked at options such as the Bayonet attack, but am now considering to seemingly blunder with moves like 1. h4 2. h5 looking to prevent his g6 push, and taking him out of his beloved KID theory. Is this advisable? Or should I look to play a more standard game.

Imho standard lines at the intersection of KID, Modern and Pirc Defenses are more advisable.

If you are typically an 1.e4, playing something consistent with what play against the pirc, 2...Nf6 3Nc3 seems sensible.

You could try 4.Nc3 Nf6 5.Be2 O-O (5...something else 6.Be3 and wait a turn) 6.g4 if you just want to go crazy. If Black plays passively it's an easy attack but if Black seeks counterplay the game can get very sharp. At any rate you won't be in Kansas anymore. 

Thus far I've looked into various Pirc lines that supposedly give an edge to white, but I am certainly considering the lesser played lines (such as 6.g4) as I feel better suited playing an open, chaotic game.

do nc3 then fianchetto your king bishop too and try to lock the center.