Be careful with those easy outs they brake too.. Then you are in trouble.
I would start with taps. Start with the smallest one that fits inside the brass and thread. Then the next size up and up until its all gone..
Or if you have another place to pick up oil pressure, just run a sheet metal screw into the brass.
I always wanted to try a counter clockwise screw into one of those deals...
My dad use to get a small chisel and work the broken piece until it screwed out. I don't have patience like that lol..