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As far as getting that broken bleeder stem out, something that works well is the rapid thermal expansion of surrounding material, or as in this case the rapid contraction of the inner piece. Bearing installs such as LN recommend this type of install.
DANGER: use proper safety precautions before using the following and I am not responsible if you do not!
1. Use a good penetrant such as Kroil or PB Blaster and let soak.
2. Get a GOOD extractor.
3. I have access to and love to play with liquid N2, but I'd recommend you go get a piece of dry ice and break it into a point that will contact the broken stub.
4. Set in sun and let caliper heat. (It is currently 104 deg here)!
5. Put caliper in vice with bleeder up.
6. Take dry ice using tongs or pliers and touch the tapered end to the broken stub for a minute or two. You want to rapidly cool the stub and not the surrounding metal, but don't worry there will be enough latent heat in the caliper if it's not perfect.
7. Immediately insert extractor and turn.
If done right the stub will turn easily. And you can wow the kids and make N2 smoke in a bucket to celebrate when done.
Have fun!
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