@ Bennymee
"...5. standard Amiga mouse with Amiga 4000 keyboard. I don't know if the real keyboard/mouse 4KT differs..."
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Does that mean you are using the keyboard converter that came with the A4KT? Because as far as I know, the A4000D keyboard has a different connector and cannot be plugged straight into an A4KT. However, an A2000 keyboard can be used with no extra components on an A4KT. I bought one from Vesalia and I know it works.
Any idea on the price, because I am now interested.