Well, thats an interesting idea. I mean, no matter how you look at it, on paper that Liverpool had to be one of the worst teams to ever won the Champions League/European Champions Cup. With no disrespect to guys like Traore or Risse, Milan in 2005 had huge quality advantage, they've had top 5 player in the world in almost every position. Liverpool basically just had Gerrard that i would count as top5 at the time.
But they were not the ones to give up easy, and they've had some really ******* intense fan support behind them.
I've been Milan supporter since i was 7 year old - Van Basten times - but when i've heard 50000 people roaring YNWA during entire half time break like their lifes depended on it, i started cheering for Liverpool.
So to try and recreate that team i think you'd propably have to focus on picking players with very high mental attributes rather then some specific tactic. As an experiment maybe even use Genie Scout and pick players based on their Important Matches, Determination, Pressure, Ambition, with actual footballing skills being secondary(but ofc still important), then just play generic 4-5-1 and see how far that gets you.