They should try to do a sign and trade with New Orleans for Boogie.
New Orleans needs better depth and Washington needs a third major piece. Boogie would be a major gamble, but it could placate Wall. Something like Oubre-Morris-Gortat for Boogie on a one or two year deal.
Would ruin depth on an already shallow team, but Wall - Beal - Porter - Cousins could work well (assuming Boogie comes back somewhere close to where he was prior injury), even if the rest of the roster is rookie contracts and vet minimum guys.