I have a coupe too and don't like the idea of drilling a hole in my dash. What if this JDM Honda Jazz Button fit into the Blank VSN Off plug?? Then you may be able to put the engine start button into the original hazard button hole? Just an idea...
Here's a link to the Fit's hazard button with a picture below:
A&J Racing :: Interior :: JDM Parts :: JDM Honda Hazard Switch - Honda Fit/Jazz 06-08 (GD3/GD4)