Hi there @KajMagnus! This seems like an interesting feature, but also quite a custom one. The complex nature of it says to me that it will need at least some coding, that’s why we’re suggesting that you pursue the idea you explained in option B. However I don’t think it’s out of the question to suggest that people sign up and subscribe to comments manually. At least this way people can opt-out of comment notifications if they want to. Sometimes comments can get heated and people will want to not get involved.
It’s that or create a Zapier app. You would have to develop/code it, however others wouldn’t.
Hope this helps!