During the last week I have changed my Opencockpits Servo card to an Pololu Servo card, because I needed more than 6 servo outputs.
So I grabbed a 18 servo output card from Pololu.
Also the card is natively supported by Prosim, therefore no SIOC is need anymore.
The card was connected and worked as described. All Servo assignments needed to be redone in Prosim and a short testflight was successfull.
I can fully recommend the card to anyone who is looking for a servo interface.