I believe tasmota supports no key. I say this because it will let me not type one in. I have not tried on an open network as all of my are secure.
There is a templates page for tasmota that sites plugs people have used, a-little reading would be required in which ones support tuya converts currently.
Want something that works as stock for a professor who is not tech savvy. This network is secured by MAC address for devices that do not work with Enterprise level 802.1X security.