A very cheap and good source of protein for me are beans. Baked, good chewing, warm - body friendly.
I did gym for a few days per week when I was younger,
following body kg/g protein as 1-2g per kilo, ... did diet twice.
As the years went by, looking at bodybuilding lifestyle, 20, 30, 40, 60, 90, 100 years old, nowadays the human body can hardly absorb/transform such a high amount of food.
100kg muscle male at 100 years old - I think it's more simple to look at time, instead on some narrow goals and ways to achieve.
The human body isn't made with such capability, but it's good because have anothers.
I feel an unfriendly approach is a bad start. The body is good, if you want less protein intake try it, see what changes. Things come in complex. For me, protein increases the mind's capacity to focus, but decreases the speed of thinking. It increases muscle amount, but requires more water to hydrate the body, and water to clean the body from it. It is also a good source of energy, but procede many minerals and if the stomach did consume it, it's on its way to the toilet - which is also good from time to time because I feel overdosed by food, so it fills its reserves.
I personally like bread, "spread", beans, rice, potatoes etc. But follow what's good for you / fits you best. Forcing things is like making enemies from friends :-)