Great ideas!!!

I had to look up Wire EDM too.
Eletrical Discharge Machining.

The bolt is the upper, first left of center timing cover bolt.

It did twist off during removal due to rust, as did the one at 9 oclock.
I progressively drilled and tapped the one at 9 oclock without any trouble.

I have considered going without that bolt, but if it leaks oil, I'm really going to hate myself. Looks like the punch and carbide bit are the plan.

The carbide ball sounds good too, if I can find one small enough.

I may never use an Ezy Out again.