Sorry for the long wait. Busy day
So, you can indeed enable or disable a theme or a component with a simple API request.
You’ll have to create an API key with the right credentials and assign an admin user to it.
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in your Discourse: admin panel → API → + New API Key
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in the script you’ll use, as mentioned, do a PUT request on
https://yourdiscourse.com/admin/themes/[id_theme]
with the proper headers (see the authentication part on https://docs.discourse.org/) and a JSON body such as:{"theme":{"enabled":false}}
This will disable the chosen theme/component. Video example with Insomnia: