pBreak should be the same circuit as the other output pins and should wire to the non-grounded side of the parking break switch....which will probably be a pain in the butt to get to.
I had a thought about the safety of the parking brake interlock, only make it activate when putting the top down, since you have the extra step of the top latch, but leave the close interlock as is so you have to click the parking brake handle one click manually. That way you don't accidentally close the top while driving down the highway.
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