[Retros] Fastest fake Castling

[Nicolas Dupont]

Some years ago, I constructed a game showing fake castlings for both  
sides (Phénix 2002-2003). The game goes as follows:

1.g3 g6 2.Fh3 Fh6 3.Fé6 Fé3 4.f×é3 f×é6 5.Rf2 Rf7 6.Df1 Df8 7.Dg2 Dh6  
8.Dé4 Dh3 9.Cf3 Ch6 10.Tf1 Tf8 11.Rg1 Rg8

Is it possible to show this same double trick quicker ? Constructing  
such a pg but with long castlings would be interesting.

The "opposite" question of the "invisible" castling is also interesting.

Formal definition: On the position diagram a King and some Rook stand  
on their initial squares, but a castling involving those pieces occurs  
during the game.