Obviously, if you can trade Brown and pieces to get Luka, that is ideal. Same to get Embiid.
Since those are extremely unlikely, Brown for Towns might make sense, but I'd imagine pairing Towns with Robert Williams may have the same result as pairing Towns with Gobert.
I like the idea of Lillard for Brown, but there is a huge age and durability discrepancy.
How about Brown for Trae Young? I know we lose a lot defensively, but maybe we can actually get a shot maker and a player who can create offense for others. This would clear up a lot of redundancy for both teams.
While we're at it, can we somehow add other pieces, like Grant Williams and Brogdon for Collins? I am not sure how the money works, but I see Atlanta as a viable option where both teams can improve from a deal.