UK perspective:
If you are operating on an AOC, you need an authorisation from your Part-145 maintainer.
If you are operating private, there is NO PROVISION for such an authorisation to be issued - if you have one from a 145 MO for private flights, ask them under what part of the regulation it has been issued.
If you fly private, you fit/remove duals at your own risk.
And on a B206, IMHO, don't touch the pedals whatever type they are.