Custom Wires for VEXU Robot

We need to connect an additional motor, but there are only 2 available ports (port 1 and 10). As we all know port 1 and 10 are 2-wire ports, since we cannot use the extension cable (3-wire cables) available in the “276-2800” kit. Note that 2-Wire extension cables are not available in my country.

That being said could we use custom wires (non-VEX wires) or modify the 3-wire cables to become 2-Wire ones?