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It would be great if there's a way to store the profile on an NFC tag. This way, I could tell my guests to tap the tag to connect to my home network.

I use QR codes for this, they work for both android and iOS.

This link explains how they are formatted: https://qifi.org

An NFC tag with the same contents as WiFi connection strings also work.

I use QR codes too. Otoh NFC tags only work on Android, I haven’t managed to get them to work on iPhones yet.