@efraimip I don't believe this specific plugin is supported anymore.
Does a tool like this exist now, or is it in the works?
There is nodebb-plugin-customize when you want to make quick modifications to templates or translations. Between that and Custom CSS in the ACP you can modify most aspects of your theme without creating a new theme or subtheme.
99% of all posts in the "nodebb themes" forum are questions - not themes (I found actually only 1 single actual theme in searching many pages of that forum)
Here are some themes I know of that I think are still maintained: