Nobody in their right mind
"Nobody in their right mind wears earbuds for the duration of a long-haul flight"
Find a good set of in-ear phones (for the audio), find good buds for them (foam, rubber, whatever), get used to them, and you'll be fine with them for many hours on end. Very small, generally cheap, and easy to manage on a flight, at your destination, and for the entire trip.
Certainly, from my point of view, having some thermal insulation hanging by my ears would be an unbearable thing for more than a few hours. But then you do say "Hot I can deal with, as one of the reasons I like to wear headphones in the air is to stay warm". Seriously, WTF? Would you uprate headphones because they had rockwool over the ears? I have never been on any flight where being cold has been a problem.
Couldn't you just wear a hat? You could write "Beats" on it to make sure everyone knew you were cool.