Converting template+app VM images from ext4 to BTRFS

Great job on the latest XFCE version of Qubes.

Has anyone tried using btrfs-convert inside the images to switch them from ext4? Is anything else needed to achieve this? What best practices would you foresee?

(Of course I don’t plan on using COW on the images outside or even BTRFS for some - not concerned about deduplication/reflinks - I need BTRFS checksums with as little overhead as possible - they saved me from a bad SSD batch - but ext4 over COW BTRFS is a no-go for heavy I/O and possibly (?) also for reliability in case of failures)