So do you have to suffix your callsign with 'Cessna 206 Heavy'? Geez, its just a dirty ole motor plane!
I would agree get an experienced pilot, not an instructor, perhaps someone who has or used to operate the type in the real world and after you are allowed to private hire the aircraft, take said pilot with you and I'm sure for a carton or two they will instill a great deal more practical commercial operating techniques than an experienced instructor could. Not having a go at instructors, just my two bobs worth.
Plus, the two cartons would be much less than the instructor hire, and you don't have to fight the experienced bloke about who is logging it as command....
j3