Did you try to set it up? Some time ago I removed validation for wss protocol to enable local on device relay setup.
It seems it's working with no problems with Citrine local relay: https://image.nostr.build/23f720771110a89c1b26ea311dc98076116f95d83f8003e8eb29b9c15455928a.jpg Although, I think an option to detect and suggest using the local relay would be sooo cool! 🫂