'whom' is moribund, close to death.
Yes, whom is correct.
It is a choice and most certainly not the most natural one.
Knowing what an ace English teacher you are, I trust that you know what a corpus study is.
Corpus-based approaches to language studies have a number of limitations, and ignorant use of them can lead to people making unwarranted generalisations.
You mean like the part where you say,
"I find it more natural to say/write 'whom'."
No, Mika, whom is not correct. It is a choice and most certainly not the most natural one.
Whom is a choice?