Regarding some of my investigative work, we will be working on towards this is allowing snaps to use lzo as compression format, but more work on this has fallen to the wayside a bit on my end due to the impending UC20 release (specifically we want to do a thorough check of cross-arch and cross-distro compression of lzo snaps to ensure it’s deterministic). I hope to get back to this work soon, which will unblock snaps from being uploaded to the store using lzo compression.