I'm going to serve meat to my vegan husband to save his life
Why do you think it's going to save his life?
I don't know, I just think I am going to save his life by doing this.
I would also feel like I need to do something if someone needs help medically, but sneakily feeding your husband meat when you know that he's a vegan it's a very unethical and immoral thing to do. How about you go with your husband to a doctor, to see if him being a vegan is really dangerous to his health?
Don't condescend to me, I know what I'm doing.
Have you considered what his reaction would be to your action? It's likely he'll feel betrayed by the sneaky addition of meat to his food, and if he hasn't eaten meat in some time, it could make him sick. Your proposed action risks severely damaging your relationship and harming your husband.