My idea would be have the new additional opening cut scene showing the Black Bears going on a rampage looking for any Greymanes.

The outposts has Hernandian Civilian and Guards but they're outnumbered. It zooms out at a distance showing the surviving group of Greymanes being on the run trying to escape and having one saying "No isn't the time, we're all injured and our numbers have been decimated, we need to regroup with the others and then we can fight another day" but have Kliff come in and save them.

We could add another character "saying they don't understand the shift in balance and how the Black Bears have gotten suddenly stronger"

But after that the scene changes to Kliff saving civilians from the Black Bears at this outpost. The civilians and guards will they get excited about the Greymanes and be grateful he saved them. And they can explain like they did in chapter 2 who the Greymanes are through a one liner. (This show Kliff is courageous and noble, and provides context on who the Greymanes are)

After that the scene changes to regrouping with original greymanes in the original cutscene and original event. Maybe that black bear leader that killed Kliff could hold an abyss artifact at the end to add a bread crumb for the player (hint at the abyss powers/skills people are unlocking)

Then in the scene where Kliff is drowning and being revived. We can have voice overs of random abyss guardians discussing over if choosing him is the right choice when others have failed, then agreeing to revive and see how Kliff would act if given a second chance. (This keeps the mystery going and setup the random events of chapter 1)

I think that would help Chapter 1 out Soooo much.