Hi Jaans, thanks for your fantastic answer.
Do you think this USB cable would fit that place on the left? http://rbx.hu/startech-usbab1mr-1m-usb-20-a-b-kabel-jobbra-ford-p372810 It needs about 6mm space between the OS and Hunter housings. If it does not fit then I will go with your soldering solution.
Thanks for the warning about overheating the wifi router. My Hunter controller is located on the west side of my house and is directly exposed to sunshine between cca 3-6pm when it is not very hot so I hope it won’t be a problem.
Another big thanks for mentioning the flat UTP cable that comes with the router. I was just going to order one.
Regards,
Zoltán