Kevin Durant with better passing and worse defense is probably the best comp.
But I think the Luka comparison was too swiftly dismissed. I agree that when Bird played, he didn't initiate the offense on the perimeter like Luka does, but he played in an era that defined positions much more rigidly. If Bird played today, with his handle and shooting ability, a modern NBA offense would hand him the ball like Dallas does with Luka. Everything would run through Bird as the point forward. I think the comparison to Doncic is less about how similar their games actually are/were, and more about how the modern NBA would deploy a guy with Bird's skill set.
And really, I get the urge to call out the Luka comps as defaulting to comparing two white guys, but honestly I think the criticism itself is a bit lazy. Bird's tough to find comps for - he really was a unicorn. A 6'9" guy who was the best shooter in the league, could handle the ball like a guard, and score from anywhere on the floor? Plus a limited but effective defensive game? I guess you could say he's Antoine Walker if Antoine believed in concepts like efficiency and actually impacting winning. Tracy McGrady if T-Mac was a worlds better shooter and passer. "Playmaking Paul George" sells Bird short, in my opinion. I dunno, he's a pretty unique combination in terms of skillset, and I don't think it's crazy to point out that there's similarities in Luka's game.