> identify and surgically or chemically remove the part of the brain that is responsible for suffering,
There is no part of the brain responsible for consciousness. Consciousness is a process and it involves the entire system from the inputs to your brain (like me telling you that you’re ignorant) to the peripheral nerves to the complex sub-sectors of the brain.
> breed animals who enjoy pain, not suffer from it
You cannot enjoy pain. That’s quite literally a contradiction.
> Many of these are probably way easier and more practical than shaming people into giving up tasty steak
None of the ideas you have posited are easy, practical, or make any sense whatsoever. Shaming people into giving up tasty steak is a weird way to frame the problem. Shaming people for placing a momentary experience given to them by steak on their taste buds as worth torturing cows to death for is a viable and important strategy, because it is fundamentally sound.
> Because most people do not truly care about reducing animal suffering, they care about a different metric altogether, a visible human proxy for animal suffering that they find immediately relatable.
The best way of reducing animal suffering would be to reduce the number of animals currently in existence and reduce the number brought into existence. Ending factory farming is a very effective way of doing this, considering that an extremely large proportion of the most sentient creatures on the planet (mainly mammals with very complex brains) are brought into existence by the direct action of humans, for meat consumption.
One of your ideas, shrinking or even removing the brain, is already being developed. We are making meat without the animal, which means without the brain. We are using technology to do so. This is cultured meat. We are also replicating most of the properties of meat and making plant based meat (see Impossible Foods, Beyond Meat). Both of these approaches are effective and practical.
Is it practical to wirehead tens of billions of chickens every year? No, it’s not. It’s impossible with current technology. We could surgically implant carfentanil secreting devices in the spinal cords of every chicken, but the process of doing this would drive chicken meat costs up so high that the world would just go vegan instead of paying for them.
I urge you to think more clearly about this issue, instead of trying to find ways to justify your current lifestyle.
If an exact copy of you were to be created, it would have to be stuck in the hole as well. If the ‘copy’ is not in the hole, then it is not you, because it is experiencing different inputs and has a different brain state.