Pi Zero USB Stem is a quite useful Raspberry Pi Zero addon if one wants to use Pi Zero as a BadUSB device. Adds a USB A port that can be used instead of the micro-USB one. Requires some soldering (my minimal skills were enough).
sparkfun.com/products/14526
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Another useful addon is Solderless Serial to USB adapter. Essentially a USB/UART with a micro-USB port that can be attached directly to Pi Zero. The pins are a bit thick and had to be filed down, but besides that the addon works perfectly.
shop.pimoroni.com/products/solde
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Here's a picture with both addons attached.
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