Yes but it’s really very hacky I’m not sure if you have the skills 
I’ll try anyway.
You open your browser console on the page, after clicking create the device and seeing the red error
(right-click → inspect element)
You find the request that fails (in red), it should be a POST for the device.
You right-click the request → copy as fetch
Then you paste what you get into a text editor, and remove the duplicated brightness feature from the JSON.
Then you re-paste the request into the console:
(non-contractual screenshot, I picked a request at random)
Then press enter to replay the request.
Sorry, this is really a hack and not at all in Gladys’s philosophy what I’m proposing, but right now I’m swamped and unfortunately we have very few active devs on the project at this time of year, I feel a bit alone 