Aroa,
If you have single engine charter on your AOC you have ALL piston singles under 5700kg.
You don't need to "put the 206 on the AOC". This has been the case for 3 years or so.
It took me nearly 6 months in 2009 to put a PN68 on my AOC, when it already had Baron 310 and Chieftain.
On the other hand, in 2014 it took less than 8 weeks of CASA work to get Conquest (our first turbine type), because i better understood the process and the requirements.
RPT is a different matter i suspect.