I thought Lex was not all that pro-Belle Reve for mental health. Rather, he doesn't much like Chloe anymore (just like he doesn't much like the rest of SV anymore) and thought it would be a good idea to do what Lana wanted -- because he loves her, just like everyone else does, and because it's a way to get back at Clark. And since Lex doesn't remember just what happened to him there, he may not know what they can actually do to a person -- though he probably has a general idea; he just doesn't care much.
Did you suspect that Lex suspects that Chloe knows something about Clark's secret and saw it as a good opportunity to find out? I sort of got that vibe from him, whether or not Lex would actually admit that even to himself.
I did get that vibe, but I find it unsatisfying: at this point, Lex should either have convinced himself that Clark is nothing special, or he should know, and the halfway suspicion stuff is getting very old.
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