I couldn’t wait any longer! I had to disassemble the Aiptek Z500+ and find out if had a ribbon-cable between the PCB and sensor.
It did! Success! It it was quite a long cable as well. Perhaps I don’t even need to replace it with a longer one, it might just be long enough as it is.
I made a project page on the progress which also contains a step by step guide to how to do the disassembly;
More info and pictures