W3N were designed so that this would be possible. All web3names must be prefixed with w3n: e.g. my w3n is w3n:weichweich. Other parachains could use different prefixes. I think this comes close to what you propose?
wrt UI I imagine the vast majority of registrations should come from the wallets (Nova, Talisman)when creating an account as part of the onboarding flow - i.e. easy flow offering user to create a name at the same time as creating an account. They should also allow for registering names for existing addresses and then as an additional offering - a simple āPolkadotā UI as with the staking dashboard.
I can also see that the likes of sub.id, Polkassembly, Subsquare, etc could add this functionality into their products - especially if we can somehow tie it in with the existing on-chain ID system.
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