Update: Interestingly enough, using hostapd seems like it might work. I haven't finished manually configuring DHCP, DNS and forwarding; but the WiFi hotspot is running on the Pi with the built-in interface, and I can connect to it using another device.
- Host a Wi-Fi hotspot with a Raspberry Pi · raspberrypi.com
- Create wireless access point and share internet connection with nmcli · unix.stackexchange.com
- Five commenters mentioning that the
nmclicommand does not work for them, but for the majority it seems to work
- Five commenters mentioning that the
- Raspberry Pi Hotspot/Access Point not working, no connection whatsoever · raspberrypi.stackexchange.com
- Problem there seems to be at a later stage (devices seem to be able to connect to the Pi, they just can't get internet)
- Turn Your Raspberry Pi into an Access Point (Bookworm ready) · raspberrytips.com
- Uses
hostapdto host the hotspot
- Uses