What Would be the best opening in this position

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TheJaguarGambit
I was goofing around in the analysis and i thought of this Position and i was wondering what would be the best opening in this position here it is:
It can be a real opening with the first few moves or a made up opening for this position
also I might post another version of this of how other people think this game would go
Lemonade
Lemonade

Idk

Lemonade

I felt d3 would be optimal since it defends the pawn

Lemonade

G3 ready for f4?

TheJaguarGambit
I think the king moves would be more optimal as if this was a real chess game the king would want to stay with the pawns with like a middle game and an endgame