After some thinking I don't believe that Lillard, Young, Beal or Towns are longterm solutions, since it won't solve the financial congestion. Many may disagree with me on the fit and or quality problem of Brown, but the new CBA constraints can't be denied. Basically when you get over the second tax apron you can't do anything, it functions as a hard cap.
Again to paint the picture of how it would look like if we had Brown and Tatum on supermaxes imagine the current team without the first core guys we won't resign because of the financial implications. That would be White, Brogdon and Horford. So then you'll have the hypothetic situation of Tatum, Brown + two good role players (Smart and Timelord?) + vets/rookies.
It's not the road that I want to take. Brown is not a 'second' superstar. Not even close (comparisons: Wade, Bryant).
The teams that I have as serious potential trading partners are Cleveland, Memphis, Houston and Brooklyn.
Now Cleveland is super interesting with a swap of Garland and Brown as basis. The Morant situation is something to monitor. If Houston signs Harden they'd jump on us with their young talent. And the Nets have Bridges who I don't think they'd want to deal, but if we take on Simmons that would change everything.
To Boston: Garland, Okoro (starters: Garland/White/Hauser/Tatum/Williams + Brogdon)
To Cleveland: Brown, Smart (Mitchell/Smart/Brown/Mobley/Allen)
To Boston: Morant, Adams, Kennard, Aldama (starters: Morant/White/Hauser/Tatum/Adams + Brogdon, Williams)
To Memphis: Brown, Smart, Horford, Gallinari (Smart/Bane/Brown/Jackson Jr/Horford)
To Boston: Sengun, Eason + filler? (three team trade?) (starters: White/Smart?/Tatum/Williams/Sengun + Brogdon)
To Houston: Brown + more?
To Boston: Bridges, Simmons, O'Neale + #21 + '27 PHX 1st (starters: White/Bridges/Tatum/Simmons/Horford + Williams)
To Brooklyn: Brown, Smart, Brogdon, Gallinari (Smart/Brogdon/Brown/Johnson/Claxton + Dinwiddie)
There are a couple of star players in the 25+ age group I'd love to see in green, but that's not happening (Jokic, Booker, Gilqeous-Alexander, Doncic). So my focus would be on the next generation playmakers: Morant, Garland, Haliburton, Ball. If we could nap one of them we'd be set for the future.