07 Honda Civic sedan door triggers

I have an 07 Civic I need to work on - doing a Python 990 keyless/remstart/alarm in it...I have information about the door triggers, which wires and where they are located, but I can't for the life of me get anything to test.  And even if I did, the wires are all supposed to be in a grey plug on top of the fuse panel, which is underneath the lower dash panel; the problem is that there is almost zero slack on any of those wires, shy of parking lights or maybe trunk pop.  Has anyone had experience here?  I don't want to tap domelight for the door triggers, I don't like doing that nearly as much as actually getting the door triggers.  I may resort to just using factory arm/disarm instead.

Thanks ahead of time for any advice you can offer.