Personally I have to wonder if the ASR (clone) issue and the pickiness creating a bootable external drive on M1 Macs are not related. I have no way of testing ASR at the moment but I will take Apple's word that it doesn't work, and given that in order to install a bootable version of macOS 11 on an external drive requires a very specific set of conditions leads me to wonder if it would be possible to successfully create a bootable clone under lesser conditions/constraints?
