Avi, while not mentioned by rav moshe, the rationale seems to apply and is something of a kal vechomer; pas palter has an extremely solid foundation of heter, with communities being meikil for literally thousands of years, yet we’re taught to take on this chumra for the aseres yemei teshuva….one would think that if someone is meikil on a similar derabonon food shailoh (without the historical precedent of the former) it would follow to be machmir during the aseres yemei teshuva, wanting to show Hashem that we want to improve and grow.
As good of an idea as it sounds, have any gedolei poskim advocated for it?