On the website of "Mundo Radio" I found an article that makes it possible for me to key an amplifier with my Icom-706MKIIG. The article is originally written by WB8BFS.
Because it might be nice to use my ACOM-1000 with the ICOM IC-706MKIIG, I decided to make this "modification". A must for me was that the 13 pin ACC socket remains free for other purposes like digital modes. On the website from WB8BFS is a very detailed description how the modification with one single Darlington transistor (TIP127) is done.
Because I do not want unnecessary soldering to the delicate PCB I have soldered the (red) wire not directly on the board but at the other site of on the board, on pin 3 from the ACC socket.