Assuming your reason for taking N is the same as everyone elses, why on earth would you want to take something that would make you vomit instead of preventing vomiting?
I've read some people have managed to get away with throwing up SN with little to no consequences on their body. But I'm pretty sure something stronger like N is going to cause some damage to your body if you unfortunately manage to vomit it up before it takes full effect on your body.
You want an antiemetic to help prevent vomiting. Meto isn't an antiemetic (Edit: I got this wrong sorry, it is an antiemetic), but I don't know if taking Meto before N or SN helps with CTBing or not.