I am relatively new to Nightbot, I have perused the forums and asked on Twitter but I see no immediate answer to my question. Er, which is:
Is there a way to create a timer which would automatically choose a streamer to promote - whether it be from the list of streamers I follow, are currently online, or from a list I would provide?
There isn’t an easy way to provide a list of eligible online streamers without the use a personal custom API. You’ll likely need to reach out to someone to create something that your looking for.
You could seek around assistance on programming forums or hire someone to do the work for you. Given your requirements though there doesn’t look to be a pre-built solution out there already unless it’s a fixed list of users.