Have you tried NDF or NDF Plus as a chellator. It's mostly sold to chellate heavy metals, but it has also proven to be effective against organophosphates. My wife has used it. She doesn't sweat (which is the body's normal route to get rid of organophosphates) but this stuff seems to have helped immensley.
She stopped using it last year, when her liver got serious problems, but now she's started flushing, she's ready to use it again. It is incredibly effective against mercury. After her dental work, when she felt really bad, a dose of this stuff cleared up most of the symptoms within an hour. Have a look on www.healthydetox.org and www.bioray200.com. It's natural stuff. A bit expensive, but worth every penny.