[aerohead]

So far,I've identified 165 vehicles,from 54 different manufacturers or universities,which used template-like bodies,or located a rear spoiler along the templates pathway.
Maybe there'd be a chance that the Kamm-back mod would show at the gas pump.
MetroMPG coined the term 'Cardboard And Ductape' (CAD) design,years ago,and I was thinking that you could fab up something using this technique,then attach it with 3M,Blue Painters Tape.
The cardboard and tape would hold the Kamm together enough for testing.The 3M tape would hold it securely to the Honda,without any chance of leaving a residue.
Just thinking out loud.
The Insight-II,Accord Crosstour,Clarity,and some of Honda's lowest drag concepts are all Kammbacks.
On my '84 CRX,I created flying buttress C-pillar extensions with an upper deflector,then rear wing,to 'enclose' a vortex within the template footprint,creating a rudimentary Kamm greenhouse,then added a foot of boat tail.It helped it get down to Cd 0.235.I can't imagine something like it not helping.Just a hunch.