Just remembering you mentioned you have mapp gas, it might make what is left of the nipple softer and easier to crush into the center with chisel.
Being me, I would use a Ace/oxy to get it out, been real lucky doing it that way.
Many times on exhaust studs, I heat the manifold up and use bees wax on the stud allowing them to turn out.
But each problem presents a different approach as we all know.
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