Automate ao3/FanFicFare Downloads?

I went on a deep dive of the sub and wasn't finding anything related to automatically downloading fics...

TL;DR: Ideally, I would like a way to have Calibre automatically download and/or update certain fics from my ao3 account - whether it's fics marked as Mark For Later, within a certain bookmark tag, authors/series/individual works subscribed to within my Ao3 account, etc. Am I wishing for something impossible?

I've got hundreds of fics downloaded, some complete and some in progress, and if I just select them all and then tell Fanficfare to update them, it usually times out on me. Additionally, without going one by one, I'm having trouble keeping track of which ones I've added to Calibre at all and which ones I haven't yet. I've used the ao3 downloader python app, but even that can't know what I've downloaded vs. what's newly added since the last time I used it, unless I'm missing a functionality there. Again, if I use that program to generate a list of links to paste into FFF, it ends up being way too long and without going one by one, I can't tell what's already in my Calibre library.

In a perfect world, I envision something that works sort of how Libation works for audiobooks, where the books get added to the library based on what's showing as "in" your account but not yet added to the desktop program.

Does something like that exist? If not, is there any way that's something that could possibly be a new feature for the FFF plugin in the future?