I know about sonarr but I'm really quite happy with my flexget solution. It might not have the simplicity of sonarr but it's very very powerful and flexible. But once flexget hands a file over to deluge I need deluge to be able to do things once it's done and using the deluge execute plugin is great for that. But the lack of curl is hindering me.
Perhaps there are another deluge docker that happens to have curl installed by default?