Not me... But if you can come up with a solution that will suplament the existing tail lights, that can be seen from the side, I'd be interested. The Prius V gives no indication of a turn signal to anyone that is even with your car... Perhaps that orange reflector in the light housing is replaced with a bright LED lamp that operates with the turn signal lamp.
In an ideal world, yes, and that is a great writeup. Given complexity, manual dexterity, patience and available time, unlikely.
I agree, and I'm comfortable working on wiring and tapping wires, but I despise tearing off interior trim panels.
Really. When the panel covers were easily R&R'd with a flat screwdriver and wiring was 18 gauge stranded with bullet connectors, it was fine. Now that it's down to 24 gauge solid with mega-pin sub-miniature connectors and origami-like panel unwinds/rewinds, not so much. Tempting, but I know my limits.