Here is an answer I got from a bike shop (thank you Ray!):
"Hi Al,
There are two ways to do it. You can remove the brake lines then insert the connector cable, then redo the brake lines which will require you to bleed the brakes. You can also cut the connector off, cut the current wire to your purion leaving enough cable to solder and shrink tube the individual wires and to make sure the solder and shrink tube section is pushed down inside the frame.
Neither one is a quick project."
Search continues.