Time to update the project status... i guess.
I have removed the pins of the derringer. partially because some pins were broken of, but mostly because the derringer wont fit inside the case with the indievision installed.
With an extra socket fitted to the CPU socket the derringer got just above the indie, but because of board warping it is under pressure when "forced" into the slot.
And the keyboard wont fit, it comes to rest to-three millimeters from the post it is supposed to rest at, and when gentle force is applied to the keyboard, the derringer pops out of the cpu socket.
I dare not even start the computer like this. afraid it will damage something.
I then decided to remove all of the old pins from the derringer and replace them with copper wire into the cpu socket and soldered to the derringer. First i will find a location where the derringer is at rest, no more stress and no more warping the board. finding something to rest the derringer at on the edges.
Then i will carefully solder it at a slight angle where the derringer will be above the indievision but still under the keyboard.
When i find a IDE solution that will work with the derringer on top, i will solder everything firmly in place.

Any one got any idea for an IDE solution?
That was a lot of text..... time for picture.
Before attempting to solder.