Chametz leavened bread is any one of the main five types of grain that has sat in water for more that 18 up until 24 minutes.  So if one takes pure oatmeal and makes boiled porridge, that is not chametz. And not only that but after one has made boiled porridge it can never become chametz. 

 There does not seem to be a good reason to seek for extra restrictions.לא דייך את מה שאסרה תורה? As the sages said:" It is not enough for you what the Torah has forbidden that you seek to find new things to forbid?]