thats also easy - if apparmor is activated and there are rules missed for some packages - write them, bonus point for upstream them to debian.
Misunderstood the snapd part - the sane way would be: help to get lxd into debian, but thats not an easy task. To get a full working LXD that will need some changes in the kernel, the right now missed dependencies packaged and of course zfs as preferred storage in debian. Not that easy.