Ooh that would have been a deal breaker but then I remembered npubs are unlimited 🤘 is this the way all ditto moderation will work? Via nip5 identity?
You can still respond on the local feed, but if you want your posts to show up there for others to see then you need to use a henhouse NIP-05: https://henhouse.social/settings/identity
You can own multiple NIP-05 ids, but only one can be applied to your profile at once, so yes it will also change it on other clients.
ps. Welcome! 👋