Thank you for those infos guys
To give you some clues about my profile :
Am french, holding FAA & CAA/JAA CPL/IR
1300 TT, 500 ME, no turboprop experience.
Legally, I can fly a "N" registered A/C with a MTOW 12500 or less, with no TR.
The Cheyenne 2 we plan to use will be based in Europe under "N" reg. So legally, I don't need any sort of training; but common sense rules to have some
Basically, am looking for an organisation, not necessarily a TRTO, with Cheyenne experienced pilots to brief me heavily on this A/C
(handling on my A/C, and Sim training if available)
As it seems to be difficult to get this training in US for the "non US citizen" reasons, I am preferably looking for a european based school.
Many thanks for your help.