Theoretically you could facelift any X5, it's just fenders + headlights + front bumper cover right? You could also swap the hood if you wanted the facelift grilles but I honestly think the facelift grilles are a little uglier. If you found a facelift X5 parts car this would be relatively easy.

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2003 X5 4.6 | 2000 540i Touring

Formerly owned:
2004 Range Rover | 2000 M5 | 2000 540i/6
1995 750il | 2003 Mercedes S500 | 2003 540i/6