Doesn't the Finalizer event show up literally every single day? It's not like you're under a time constraint to unlock before the event vanishes for 3 months.
If you refresh each node once a day (25 crystals x 4 = 100) you will be done in a month. Drop rate is ~30%. 10 sims a day = 3 shards a day on average. That's about 100 shards per month.
Farm all 4 ships every day. Refresh each ship's node once a day. You will have Finalizer in early January. And before you come at me with vibes to counter math, I have been tracking my hard node farms for years. I am not the only player who has tracked the hard node drop rates. It's confirmed. Math works out.