Definitely won't be possible to buy a cable with the pins shorted.

Let me be clear that this cable/adapter is USELESS for transferring data, or for charging from a PC USB port.

The sole purpose of this hack is to force the phone to think that it's plugged into a dedicated charger (which I call a dumb power source).

You only need to think about doing something like this if you have a USB socket which the phone will not charge from (and you want it to).

For everybody else, I recommend you buy dedicated wall chargers and dedicated car chargers - these will already have the D+ and D- pins internally shorted, and never need to transfer data.