<pre-post edit> I wrote all of the below before I realized how senior a member you are (I spend the majority of my time on the modding section of the Discord channel). Please disregard anything that comes across as patronizing; I had incorrectly assumed that you were new to the forum and going cowboy without fully realizing how the scene worked, but you've been here wayyyyy longer than I</edit>
Nexus Mods has tags, categories, and mod dependencies already. It also has a one-click install mod manager, which prevents users from doing things like merging a new version of a mod into the old version. I think mod packs can be created by making a mod that contains custom/compatibility settings, then marking the "bundled" mods as dependencies.
The site is also established, meaning that it's unlikely to disappear if the maintainer loses interest or has life generally get in the way (bus factor), which is a fairly common thing and just a fact of life.
The main reason that Nexus Mods hasn't taken off for Starsector, I think, is that it hasn't taken off. Most mods are already in one place and authors don't want to spend time updating multiple places if they don't have to whenever they release an update.
Don't get me wrong, I'd love to see this succeed and you have my permission to add Gates Awakened, but there's a lot of inertia working against it. When I release a new version, I create a Github release (which I scripted using their API to take less time), then (manually) update my release on Discord, then (manually) update my forum page, then (manually) update Nexus Mods, and finally (manually) update version checker so that users receive an update notification. It's an annoying process already.
If info was scraped, that's fine. If I need to add some compatibility info to a json file, that's fine for me, but I know that many prevalent modders treat save-compatibility as fairly unimportant and sometimes leave it up to users to report whether an update is compatible or not. This is a hobby, not a profession, so it's unfair and unreasonable to expect modders to prioritize save-compatibility (although it should be encouraged).
Sorry to be a downer. I tend to focus on making cool and fun things before thinking about whether they're the right things to make, so I totally get where you're coming from, and really do hope it works out.