This is what I did for padding. I ordered it off Amazon. It is a universal knit sleeve. Works very well as it removes pressure points.
I have to admit that while I like my 1540's, the headband padding is a joke for $500 headphones. Your solution looks a little to Easy for me, but I may have to try something. I've already lowered the cups to relieve the pressure of the headband, so that is not an issue, but the small amount of padding on the headband had compressed and is leaning away from my head. Umm, I'll have to see of a DT-770 headband will fit the 1540's.