My suggestion would be "triage"

On a clean surface, I would cut open the bag so it lays flat. Take a razor and collect as much kief as you can into a main pile. You can probably save 90% of the kief this way. Make sure you use the razorblade on the counter as well, to collect any kief that fell off the bag.

If you wanna get the remaining 5%, take a q-tip, rip most of the cotton off one end, dip in 90% or higher isopropyl alcohol (NEVER USE DENATURED ALCOHOL, VERY HAZARDOUS), and rub the sides of the bag to collect the remaining goodness.

Scrape off the THC soaked cotton, and smoke it. Use as little cotton as possible, obviously.