Hey thanks for sharing this!
I was able to create the environment however apt doesn't work inside the chroot due to a failure of name resolution. I double checked, and my /etc/resolv.conf was successfully copied into the chroot.
Not sure if this is a dns issue, since pinging an IP address gives me a 'permission denied' message, even as root.
I'm using a fairphone 4, might this be some quirk of my device? Or is there some way to give the chroot environment network access?