KID would probably be most common for white. After than, nimzowitch (idk how to spell). for black, copy it because they make the most sense.
What would opening meta be if pawns couldn't move 2 squares
It's called the Indian opening because India did not recognize the two space rule. I believe that's what it would go back too.
Here are the rules for chess 1.0. Note that I don't know the original names of the pieces although i believe elephant was renamed as another piece.
The rule is to capture the king. There are no checks so the king can be forced to move into danger.
Movement:
Pawns move one space at a time always. One must wait a turn for promotion and not move another piece during that turn. One can promote to any captured piece except a pawn. Attacks are the same as the current pawn.
Both the king and queen can move in any direction one space. There is no castling.
The knight moves as the modern knight.
The bishop can only move up to two pieces diagonally, but can move over a piece.
The rook can move up to two spaces up, down or sideways.

Mohishunder did employ the Indian Defenses because he did originally play traditional Indian chess, in which pawns can only ever move one square. But it’s an oversimplification, I feel, to say that it’s called the Indian opening just because of the pawn rule, and not specifically because of the Mohishunder-Cochrane games.
alekhine