Can you eat chametz during asseret yemei teshuva?

[Dani Schreiber]

This morning we read the selicha "בין כסה לעשור השלכנו רוע שאור". It's clear that this is a reference to the "bad" part of bread which we treat as chametz on Pesach, which is often analogized to the yezer hara (or at least, ga'ava). However, I was wondering if it could maybe be an allusion to the minhag of not eating פת פלטר during the עשרת ימי תשובה. Thoughts?

This actually led me to another interesting thought. It's always fascinated me that we make a big deal about kol nidrei on YK when we already did התרת נדרים on Erev Rosh Hashana. I wonder if the reason is possibly that we are annulling the vows/chumras that we took upon ourselves during the עשרת ימי תשובה. Thoughts?

[mordy]

ר' אלכסנדרי בתר דמצלי אמר הכי רבון העולמים גלוי וידוע לפניך שרצוננו לעשות רצונך ומי מעכב שאור שבעיסה