It's not a matter of it being hard to calculate, it's a matter of the solar system not being physically arranged to conveniently allow it.

A minimum-energy transit will come at Earth roughly aligned with its orbital motion. To match planes with the ISS, the return must happen at one of the two times a year where the ISS orbit is also aligned with that motion, which means the trip must have started on the opposite side of the sun from that point, half a transfer orbit earlier. But we don't control where other solar system objects are or what their motions are. Windows to/from Mars occur every 26 months. If by chance things are properly aligned one year, it will be 60 degrees off the next time, and most Earth-Mars windows will be unusable: it will be 3 launch windows, 6.5 years, before they align again. And they in reality don't line up in such nice whole numbers, so in reality you're going to have a substantial plane correction to make on arrival, even with such limited windows.