If you're going to be travelling with it, I don't think real arcade controls are going to be practical at all.
The next closest thing would be a cheap "arcade-style" joystick. These are a lot smaller than actual arcade controls (in terms of vertical depth under the panel, especially). Add (or build-in) a USB converter (if it's a console stick) and there you go.
But by far the easiest (IMO) would be a regular USB gamepad. They're cheap and ubiquitous, and they'll be good enough for most games. (Though playing games like Smash TV on dual-analog sticks is pretty annoying, actually...) For portability something like a USB-converted NES or SNES controller (or USB-native equivalent) would be great. Much easier to stick in a laptop bag than a PS2-style gamepad.