Wilcox seems like the most-likely option.
Among vet-min depth guys, is DeSangana Diop still available? Not a good player by any stretch, but I've always thought of him as being a decent defender. Legit size. Should be pretty cheap. You wouldn't play him a lot, but his six fouls would all count.
Aaron Gray could have been a decent depth signing, but he's back in Toronto.
Przybilla?
Kurt Thomas? He seems like a guy who would fit right in. Undersized, but he's always been tough as nails.
Nazr Mohammed?
I agree, I'd like to see the team have some legit size deep on the bench, someone that's not afraid to use up their fouls. LeBron killed up in part because he could drive the lane with impunity - which is the big thing that we've been missing in the post-Perk era. Other players used to say very explicitly that they hated driving the lane against us, because they didn't want to run into him. There are times when you just want to have a big body in there that's going to make them thing twice about driving.