Is it not the same as the Shimano Octalink, where you just need a square taper tool with a wider bit to push against the bottom bracket axle? Shimano's tool is to use a "top hat" adapter that slips into the threaded part of the that, with the "brim" just wide enough to sit on the outer edge without fouling the crank arm.
One of my tools has that built in - looks like a normal square taper puller, but on closer examination the part that pushes against the axle has a narrow section that drops into the threaded area of the axle, then a step wider, whose shoulder presses on the axle. Others have a swappable tip so you can put a standard or an octalink on.
Google for Octalink crank tool to see some options. I literally did this yesterday on an old 105 chainset, which looks like this when on the bike (random image off the net, not mine) - the tool presses on the really thin exposed circle of the axle, less than 1mm all around.