Ran my parking brake cable inboard of the subframe connector as well. This way its a straight shot to the back, and the cable and subframe connector wont interfere with one another.
First pic if from the front facing back. Its a 3/4" hole. The second pic from the back, the hole is only large enough so the parking brake cable circular retainer clip can fit and retain the cable. I used a 6" long drill bit to run a pilot hole all the way thru the crossmember so both sides line up. I mocked this up with my zee bar and speedometer cable. There is enough clearance to reroute it this way.
At the time of the pix being taken i had only pinned the subframe connectors in place.
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