'two birds with one stone' openings

I call this two birds with one stone openings:

-Four pawns attack against King's Indian, you immediately have a line against the Benoni too.

-1.d4 Nf6 2.c4 g6 3.f3 as a line against the King's Indian and the Grunfeld, you only need to spend much time study the saemish KID as teh Grunfeld lines here are not so theoretical (this one is maybe more a 'semi-two birds with one stone' opening)

- Slav Exchange and you have a line against the Slav and Semi-Slav

-1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4
5. d3 Nf6 6. d4 against the petroff and blacks best move is now probably 6...d5 which is exact same position as the French Exchange

-Chigorin 1. d4 d5 2. c4 Nc6 3. e3 e5 4. dxe5 d4
5. a3 is the same position as Albin 1. d4 d5 2. c4 e5 3. dxe5 d4 4. a3 Nc6
5. e3

Anybody else here got some ' two birds with one stone' openings?

1. e4, 2. Nf3 and 3. d4 work for both the Sicilian and the Double King's Pawn game (even if it's a Philidor).

The King's Indian Attack is great opening and as your posting points out killing two birds with one stone, 1.e4, 2.Nf3,  3.g3 ,4.Bg2 5.d3 is great alternative to the main lines in the Sicilian, French and Caro Kann defense.

rubinstein variation in french can be your line against both Nc3 and Nd2

If you play the Colle with White and the Semi-Slav with Black you'll get the same positions with colors reversed and the tempo having some effect on what both players can do. If you meet 1.d4 c6 with the White pieces you'll get to play the other side of the Slav structure yourself. So you get a lot of experience this way. 

That f3/Bg5 system with White that can transpose into the Kings Indian, Benoni AND the Benko.

1.f4 with White and 1.d4 f5 with Black can transpose to the same positions with the tempo changing things.