The Borg cube would find the inherent flaw in the Death Star and exploit it. Borg cubes can't be destroyed easily just through weapons fire because they're self-repairing and have adaptive shielding.
So all the Borg needs is a superstar flyboy hero type in a little one manned spacecraft with a little energetic torpedo to fly an impossible space battle against thousands of TIE fighters, fire his way to the Death Stars surface, fire his torpedo in an exact location and blow up the entire thing on his own.
AFAIR the force only works in that galaxy, rendering Force Users incapable of their super natural powers outside or heck even influence those that come without meaty chlorians midichlorians (Vuuzhan Vong).
We haven't seen the Borg using generic engineering AFAICR, but it seems like something they would do. Assuming midichlorians are canon, I think the Borg could discover and replicate them. Surely one of the species they assimilated had bioengineering mastered.
that was basically the plot of Star Wars: The Bad Batch.
The best geneticists in the universe (the same who make the clones) couldn't, but they were getting close, in theory. Could the borg? Maybe. Eventually.