It might work as long as you verify that the manifold hole lines up exactly with the stud.  It is entirely possible that they are not exactly lined up.

roger that Jeff, I just checked with my borescope, does not seem lined up at all. Oh well scratch that idea for this problem.

The outer holes, or slots, aren't very accurately placed.  I've dinked around with several manifolds.  Even with the three center bolts in, the manifold has a bit of wiggle room.  The curved surface of the clamping washer seems designed to take up the misalignment. 

Good luck.  There's not much room to work in there.  The sleeve idea is a good one, maybe you can jam it to one side to center over the stud remnant. If I was going to do another I'd try that.

So it would seem I would have to at least remove the intake and exhaust, and pull the head off just so I can see clearly where to punch and drill. Maybe could do it without pulling head, would just have to work at it at odd angles.

does the weld on a nut idea not work well? I have seen that done.

took to shop hoping they had a easy fix, have to pull manifolds off and take it from there. He did use stethoscope (I should have thought of that) and could hear no leak from around that area. His take was leave it, if it starts to leak and bother me then deal with it.

You might not hear the leak develop but you will see carbon around it and temps rising   under hood.