As it is currently, bart is a public snap in the global store. Granting classic for an internal tool in the public store is not a typical use case. Is this tool useful to others? Would a brand store where you can control all aspects of your snaps and brand be a better fit? (https://docs.ubuntu.com/core/en/build-store)
If useful to others in the global store and you want it to be used globally, can you provide specific details on why it must be classic as per Process for reviewing classic confinement snaps?