AutoRemovePlus:
As far as I can tell, the most active/recent development of the AutoRemovePlus plugin is being performed by Spring Jools, here.
I've even had correspondence with the maintainer, and had a new feature added.
I downloaded the .zip, and built the .egg within the docker container (Latest). I installed it, taking note of the advice at the bottom of the README.md, to delete existing versions and .conf files.
It appears to work perfectly well, but can only be configured from the Deluge WebGui. I have built, and installed, it on my desktop computer for the Thin Client but, while it appears to install, and can be enabled in the plugin preferences, I cannot get the actual AutoRemove settings to show up there.
So, although the plugin can only be configured through the WebGui, it does work.