I posted this on Reddit but it seems relevant to this conversation.
Other than trading players into a teams cap space. The C's could trade players into TPEs. Here is a list of current (non-celtics) TPEs that could absorb Dunn, Bruno, or preferably (to me) Edwards.
I think Bruno and Edwards could be traded to a team for a highly protected 2nd and cash. I wonder if the Cs want to play Dunn to let him recover some value. I could see a Western playoff team wanting him as a reserve to defend players like Booker, Paul or Westbrook if he's healthy.
https://www.hoopsrumors.com/2012/02/outstanding-trade-exceptions.htmlBrooklyn Nets
Amount: $11,454,048
Obtained: Spencer Dinwiddie (Wizards)
Expires: TBD (likely 7/6/22)
Chicago Bulls
Amount: $2,489,239
Obtained: Otto Porter (Magic)
Expires: 2/11/22
Amount: $5,000,000
Obtained: Daniel Theis (Rockets)
Expires: TBD (likely 7/7/22)
Cleveland Cavaliers
Amount: $1,717,981
Obtained: Kevin Porter Jr. (Rockets)
Expires: 11/27/21
Amount: $4,200,000
Obtained: JaVale McGee (Nuggets)
Expires: 2/11/22
Dallas Mavericks
Amount: $10,865,952
Obtained: Josh Richardson (Celtics)
Expires: TBD (June 2022)
Denver Nuggets
Amount: $2,193,480
Obtained: R.J. Hampton (Magic)
Expires: 2/11/22
Amount: $1,620,564
Obtained: Isaiah Hartenstein (Cavaliers)
Expires: 2/11/22
Golden State Warriors
Amount: $2,250,000
Obtained: Brad Wanamaker (Hornets)
Expires: 2/11/22
Amount: $1,824,003
Obtained: Marquese Chriss (Spurs)
Expires: 2/11/22
Amount: $1,782,621
Obtained: Eric Paschall (Jazz)
Expires: TBD (likely 7/7/22)
Houston Rockets
Amount: $2,174,318
Obtained: Austin Rivers (Knicks)
Expires: 8/11/21
Amount: $5,019,920
Obtained: James Harden (Nets)
Initial amount: $10,654,920
Used: Avery Bradley ($5,635,000)
Expires: 11/20/21
Amount: $1,780,152
Obtained: Rodions Kurucs (Bucks)
Expires: 2/5/22
Indiana Pacers
Amount: $4,796,296
Obtained: Victor Oladipo (Rockets)
Expires: 11/22/21
Amount: $3,980,551
Obtained: Aaron Holiday (Wizards)
Expires: TBD (likely 7/6/22)
Amount: $7,333,333
Obtained: Doug McDermott (Spurs)
Expires: TBD (likely 7/8/22)
Los Angeles Clippers
Amount: $2,075,880
Obtained: Mfiondu Kabengele (Kings)
Expires: 2/8/22
Milwaukee Bucks
Amount: $1,620,564
Obtained: Torrey Craig (Suns)
Expires: 2/4/22
Minnesota Timberwolves
Amount: $4,750,000
Obtained: Ricky Rubio (Cavaliers)
Expires: TBD (likely 6/30/22)
New Orleans Pelicans
Amount: $3,897,436
Obtained: Nicolo Melli (Mavericks)
Expires: 2/11/22
Amount: $17,073,171
Obtained: Steven Adams (Grizzlies)
Expires: TBD (likely 7/7/22)
Oklahoma City Thunder
Amount: $12,800,000
Obtained: Trevor Ariza (Heat)
Expires: 2/3/22
Amount: $9,590,602
Obtained: George Hill (Sixers)
Expires: 2/11/22
Orlando Magic
Amount: $4,272,060
Obtained: Al-Farouq Aminu (Bulls)
Expires: 2/11/22
Amount: $2,000,000
Obtained: Gary Clark (Nuggets)
Expires: 2/11/22
Amount: $17,150,000
Obtained: Evan Fournier (Celtics)
Expires: 2/11/22
Philadelphia 76ers
Amount: $8,190,134
Obtained: Al Horford (Thunder)
Expires: 9/7/21
Portland Trail Blazers
Amount: $1,663,861
Obtained: Gary Trent Jr. (Raptors)
Expires: 2/11/22
Sacramento Kings
Amount: $2,009,019
Obtained: Nemanja Bjelica (Heat)
Expires: 2/11/22
Amount: $3,600,000
Obtained: Cory Joseph (Pistons)
Expires: 2/11/22
Toronto Raptors
Amount: $4,832,848
Obtained: Kyle Lowry (Heat)
Expires: TBD (likely 7/6/22)
Utah Jazz
Amount: $7,475,379
Obtained: Derrick Favors (Thunder)
Initial amount: $9,258,000
Used: Eric Paschall ($1,782,621)
Expires: TBD (June 2022)
Washington Wizards
Amount: $2,161,920
Obtained: Moritz Wagner (Celtics)
Expires: 2/11/22