Great ideas here. I use a continuous ridgeline, and am considering combining your configuration with TeeDees. Right now my thinking is to put a toggle between the loop created by your double ended prussics and ataching that to a prussic on the ridgeline (or vice versa). The only real advantage would be the elimination of one of the prussics in TeeDee's setup. (trying to simplify things a little bit)
The other thought I am kicking around is to install a toggle sorta like the Byer microrope
at the end of the line and putting that through a prussic. Not sure how easy one of these will slide/hold on zing-it.