I've been thinking about this since the Bucks got eliminated. I'd tried everything but Tatum.
We just say “take whatever you want that isn’t tatum”
This if necessary. I think JB on his long contract with 5 first-round picks ought to do the trick. Giannis will sign the supermax right away since he’d be as close to home as possible with one of the legendary franchises of the NBA, so we immediately have the unstoppable Giannis/Tatum duo for the next 5-15 years. It’s a no-brainer for all involved, including Milwaukee because Giannis has seen what AD did for himself by leaving New Orleans (going down in history as an all-time great Laker even if they lose these finals somehow).
Supermax not allowed since his contract would not be with the team that originally drafted him, but I would 'require' that he sign an extension once he is traded. This is a fantasy world scenario, but we do legit have the pieces to at least entice MIL to consider it. Giannis would have to want the Cs like AD wanted the Lakers, though.
Edit: And, yes, this. No way would I include Tatum.
Trading Tatum for Giannis doesn't make us better than the Bucks are now.
It's pointless getting Giannis if we can't play him alongside Tatum.