Good catch, I concur it's an amazing tool.
There are 4" adjustable wrenches available that can be filed out to fit up to a 5/8" (16mm) axle nut. The one on the left here is an oldie that I found street-side, weighs only 48g and fits 15mm nuts after a bit of filing to the jaws.
Plenty of torque capacity if the axle threads and washer are kept lubricated.
