Pralidoxime certainly causes lysis of acetylthiocholine. However, same is not known about acetylcholine. Couple of reports say it may not. Its intriguing why it should be so?
You have probably seen the report by Pannbacker and Oehme (2003). Vet Hum Toxicol. 45:39-40, and the one by Sakurada et al. (2006). Toxicol. Lett. 166: 255-260. They provide strong evidence for the oxime-mediated nucleophilic displacement of thiocholine from acetylthiocholine along with some evidence that oximes do not displace choline from acetylcholine. This is reasonable, given that RS- groups are known to be better leaving groups than RO- in a number of nucleophilic displacement reactions. See, for example, Yang and Drueckhammer (2001). JACS 123:11004-9.