I need an opening as white similar to the Alekhine defense
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It’s got to be the Nimzo-Larsen. A couple of playable sidelines are 1.b3, e5 2.Bb2, Nc6 3.Nc3 and 2 … d6 3.d4. They should appeal to an Alekhinist, though my own results with them aren’t very good.
Why not 1h3 e5? Nothing lost and no brand new opening to study?
1.a3 is the least committal move if you want to play black as white
the downside is that a3 is not really a move you care to include in the alekhine's defense normal, so 1...e5 2.Nf3 won't be as good as a normal alekhine