A lot of options here. Some with major injury risks. Below are some players that haven't been discussed much...
Splitter is a very interesting target. He was injured for a long time, but returned late last year for the Sixers and showed a new wrinkle to his game - the 3pt shot. Apparently that's something that he's been working on while injured and he shot 6 of them in 8 games (making 2) in very limited minutes (under 10 a game).
Splitter with the Sixers...
https://www.youtube.com/watch?v=BFYos9YVmwALee was a good soldier here, but he came in out of shape and we had a glut of 4's and 5's. Curious if a second go around, with better condition can bring different results.
Ezeli was injured all of last year and was recently waived. However, he looked pretty good with Golden State and I wonder how his health is. Still only 27, he could be a great reclamation project.
Diaw plays the right way and would give us yet another great passing big. He can hit the 3, but his rebounding has really fallen off with age.
Humphries is another former Celtic who had no issues while here. He too has reinvented his game and in the last 2 seasons (under 15 mpg) is shooting 1.5 3's per game at a near 35% clip.