As Roy said, if either get bought out I'd be for it probably. Would trade for neither.
Drummond and a pick to TOR, Kyle Lowry to BOS, Kemba to CLE.
Cleveland's best young players are both small guards, this deal makes no sense for them
Yeah. You would need a 4th team for Kemba. Could probably do it, though who is giving the pick to Toronto and what is the pick. Cleveland certainly isn't giving up a pick to move on from Drummond as they can just let him walk at the end of the year and Kemba isn't work a pick for them given they have Sexton and Garland.
Keeping the general framework in place, I came up with this 4 team trade (minor picks could be added as needed)
Boston - Lowry, Morris
Toronto - Drummond, Beverly, Langford (or G. Williams)
Cleveland - Zubac, Williams, Patterson
Los Angeles - Walker, Baynes, McGee