If you’re going to be launching it into space, the cost of the device doesn’t matter a whole lot. Then you’re looking at mass, bulk, and durability. In that case, they’re already going to be carrying computers with them. Plus a controller into one of those.
There are a variety of devices that look like they’re Android tablets with a D-Pad on the left and buttons on the right of the screen that seem to be specifically for running emulators.
