I'd probably do a super draft pick trade like Holiday, Harden, etc. just got. I think something like this might work for all 3 teams.
Boston - Beal, Burks, Noel, Bullock
New York - Walker, Ojeleye, Bonga
Washington - Ntilikina, Knox, G. Williams, ~17 million TPE, BOS 1sts in 21, 23, 25, NY 22 1st (lotto)
So Boston post-trade (cut Green)
PG - Beal, Smart, Pritchard, Teague, Edwards, Waters
SG - Brown, Burks, Langford
SF - Tatum, Bullock, Nesmith
PF - Theis, R. Williams
C - Thompson, Noel, Fall
9 man Playoff Rotation - Beal, Smart, Brown, Burks, Tatum, Theis, Thompson, R. Williams, Noel