keyboard is going around in circles now.... :p
I lightly sanded the plastic off the cable, and slid it in and out of the connector, till all keys were working (had to wear through the remaining plastic)
Excellent!
Next day, I removed the keyboard, refitted it, half the keys don't work.... :/
So now I've painted it with the conductive silver paint, the whole thing! and while the paint was still green, I scratched a line between each contact to separate them from each other

Tonight I test it!