I like your thinking Matt...have you considered the transcendent friction option...second grigri on your leg loop? better back that up off a munter on your shoelace
You can obviously do this with another carabiner in the belay loop. I use the GriGri a lot and opted to buy the Freino carabiner which has proven to be more than worth it for many applications.
Oh and the video is actually an advertisement for the band "One Tribe".