I think I like the premise, but I think I would try to make it a 3 team or immediately also trade for another Guard. Someone like Beal. This trade would require picks for sure(a lot of them) and maybe a filler contract to slightly modify salary structures. This would give the C's a choice to use part of the TPE, but they would not have to. I would think it would take 3-5 1's/swaps to entice Washington, but would make for a solid lineup I would think
Beal, smart,Brown, tatum, Horford
PP, waters, nessmith, GW, RW3
With 3 empty slots for buy outs/FA/small trades using TPE slots.