I think it would be more popular for the 407 than the 206. Drill move guys would like it I think.
Are you doing anything with the dash? Moving primary flight instruments to the left?
What about a conviently mounted torque gauge and load cell on the left door post or similar.
Deleting the R/H controls would set it apart from other STCs. It would enable pax as well as a few pounds less empty weight.