When you drill out the screw make sure you use a VERY HARD drill bit or you will dull it before you ever get the screw drilled out. I suggest a SOLID cobalt or SOLID tungsten drill bit.

A couple of words of caution/advice - They are not cheap and they are brittle.

You should seriously reconsider cutting them off. A few seconds with a cutoff wheel on a dremel will do the job. Wheel collars are cheap. Even if you drill it out you will not be able to reuse it.