We have the Aton and an older Snap n Go (est. 3-4 years old?) that some friends gave us, and it definitely doesn't work, sadly. (The seat tips all the way back and forth with no way to attach securely.)
Hunting for something like this too...so far the leading contender seems to be one of the Cybex umbrellas since at least it would have some use beyond the Snap 'n' Go timeframe.
A baby store near us that carries the Aton also suggested trying the stroller straps that are designed to connect the Aton to the Cybex strollers on other strollers, so that might be something to explore too---not sure that helps if you have a Maxi Cosi seat or not. It's not an officially endorsed use of them, but the woman there thought it might work on a lot of strollers with similar designs.