The steam dock, and many other docks, just takes power from it’s usb-c power-in socket. It doesn’t care if the power comes from the AC adapter it comes with, or any other usb-c pd power source.
So, enter “12v USB-C PD 45w” into google and you will find a plethora of cigarette socket usb-c pd adapters that you can power docks with.
???“Waited too long to ship this back out”???
I have a feeling that Guam might not be in the list of places Valve will ship a new Steam Deck to
You appear to be under the mistaken belief that plugging usb devices into power supplies/banks that don’t support the most desired voltage/wattage will brick the device. This is not the case. When usb devices plug in, correctly designed devices (of which the Switch, Steam Deck, and Anker banks are all examples) will negotiate with each other to determine what they support. With my Switch for example, I have plugged it into a large number of ports, and since supporting the Switch’s desired voltage is somewhat rare, nothing happens, no charging, but also definitely no bricking. The Steam Deck, on the other hand, doesn’t mind it when the device has a lower wattage, but the lower wattage does mean that it will charge slower, or possibly drain the battery slower if the wattage is lower than consumption.
The Steam Deck is actually less picky than the average post here claims. It will even charge on 5V 1A. Not quickly, of course, and doing anything at all will drain the battery faster than it charges, but it can. One way to find out is to see if the % changes up or down while plugged into the bank.
Obviously, an incorrectly designed 20 volt PD charger that doesn’t negotiate could damage devices, but such a device would have poor reviews.
There is no such thing as a fake/counterfeit steam deck. There is, however, such a thing as saying you have a steam deck for sale when you actually don’t, so being able to see it IRL and confirming it looks like a steam deck is enough (preferably turning it on too)