You have to differentiate between an ACAAN that works, or the mythological ACAAN.
If you want an effect to be performed, you can loose the conditions, the spectators don't care about that.
So you can force a card, or a number, or whatever you'd like as soon as the effect of "finding a freely chosen card at a freely chosen number without touching the deck" (and again, of course you'll touch the deck.. as soon as you don't admit it, it's fine).
You can look for other ACAAN around to get ideas, take a look here:
https://www.theory11.com/forums/threads/what-is-the-best-acaan.39587/
If you look for the perfect ACAAN, be aware that you're chasing a white rabbit. Which is not a bad thing, i'm a fan of study and creativity, so go for it!
But remember, if you stick too much to the rules, you won't find many solutions which are not already taken...
That being said: a deck of card is shown, a card is named, a number is named. The spectator the takes the deck and proceed to count down to the named number, revealing the chosen card.