Thanks for the information received until now; the website of Sam Rutherford was found as well.
A quick feedback: We intend look at the eastern route as well more then via the political less stable countries along the west coast. As 172driver mentioned, we make it more a trip then just getting down there. However, the this will only be possible on the way back. From Europe to SA we are not directly under pressure but there is no time to stay more then overnight stops we have to go for anyway.
And yes, this aircraft is the unique flying machine. No hasle with avgas and it carries you in and out of almost any field even hot and high. We plan for trips maximum 1200NM and this means long flights at high altitudes (the PC12 goes to FL300). Luckily we have a toilet on board but of course, only for the ladies...