Apparently (according to this discussion) there is no iOS Airport Utility nor browser access to configure the AX, but it can save up to 5 configurations. So you could pre-configure it and save the configuration. You'd still have to remember to select your travel configuration before you leave home but at least you wouldn't have to walk through it each time. If you'd forgetten to do that, and you had AirPort Utility for Windows on a USB stick, you might also be able use a borrowed or public machine long enough to switch it to its travel configuration.
(Thanks for asking this - I got curious and learned a lot I hadn't known about the AX).