The ice-hole trees didn't stop growing on day two. Even after reaching what I thought earlier was their full height, they continued to grow taller and wider. I felt that they really could've turned into pillar mountains, given enough time.
By this point, the emergency forces stopped trying to cut the trees and instead focused their efforts on clearing the snow and debris they could reach without freezing. They even recovered some human buildings that were only slightly covered by the avalanche, although their inhabitants were told to keep waiting in the refugee camp.
This was when my plan C entered its first stages.
A group of a thousand special Warrior Bees have travelled on a train to one of the sites affected by the avalanche. Each of these bees had a chaotic mutation that let them spit potent acid at long distances. This acid could easily deal heavy chemical burns and rapidly corrode metal, although not to the point of melting it like some acids could do.