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Those powerbanks have a usbC output. You will need something extra to do all the handshaking to get it to request 12V out.
If you want to go that path. I would recommend a usbc decoy module and set the jumpers to say 20V. That handles the requesting so you get a fixed voltage out. And on its output use one of the cheap and easy switchmode buck converter modules based on an LM2596 to regulate back down to 12V at a few amps.
Stick those 2 in a small enclosure with a little soldering and now any usbc power bank can run all your gear. And that wont raise any issues at customs becuase its not powered.
Why i went this way is some of those modules can behave weirdly. So the buck convert will keep your stuff safe. E.g. some random power bank only supports 9 and 15V the module might request 15V and cause you some greif.
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