I love flying with my Chord Mojo. As you say, it has a separate USB socket for charging, so you can charge it while in use, if you need to. It sounds great, is sturdy as hell, and also works well on a desk, though might get you some funny looks and people asking "what's
that?". I don't think there's a portable DAC/amp device that I'd rather have more, at any price, at this point- small, sturdy, ludicrously good THD and output impedance figures.
It will drive IEMs nicely, but also drive much bigger cans too. I really can't dissuade you. I have really enjoyed travelling with mine, keeps the tunes flowing. I carry
a USB power bank in case I need to top things up when I'm not near a socket, too.
It's a lovely object and in a different league to things like the Dragonfly.