It's just as rational as shooting you urself in the head with a shotgun or poisoning yourself. You don't know what people are going through and the resources they have. Blocking an airway is essentially the same thing as restricting oxygen via hanging. Not really encouraging to someone in a bad place.
You're right, I don't know what you are going through nor do I know your circumstances. What I do know is you are asking advice on how to choke to death by food. Something that shows me you are very clearly distressed and are not thinking clearly. Thinking through whether/how to ctb is something that most people on this forum will advise.
Also equating all suicide attempts as equally "rational" is absurd. Are they the result of high emotional distress, yes. Are they even in the same category of reason, rational or reliable, hell no. People who self-immolate and those who take SN have very different thought processes.
also also, not the same thing as hanging since hanging aims for blood choke not air choke,
Listen, you're in a bad spot right now, I will PM and you can explain your situation to me more clearly there, or if you just wanna tell me to go fuck myself, id be fine with either