There is an automatic way to introduce defects into the structure. Perform an Eigenvalue Buckling analysis. The solution will have a buckled shape. The Static Structural model linked to that can include a small fraction of that buckled shape at the start of the analysis.

I didn't write the ekill script, it was given to me. I don't know where to put the ESTIF command. Open a new Discussion and ask that question there so Ansys staff might reply.