Yes, maybe could list multiple pubkeys, wallets and relays with a single identity, this would allow you to use a single identity with a pubkey/wallet on each device and no need to transfer keys from device to device whilst also having some resilience to losing any one device. The nick/identity should be sovereign.
Then if relays publish NIP-05 information on relay.domain/.well-known/nostr.json it makes identification native to nostr infrastructure and recorded in multiple locations as a consensus reference and not reliant on a single point of failure.