I recently did a little mod where you buy a Sennheiser HD650 headband pad ($7 or so) and double sided tape it to the headband of the Denon D7000. It made them even more comfortable than they already were and removed the pressure on the top of the head (since it has the gap right at the top of the head). I'm wondering if this could work with an Audeze headphone (probably with the gimbal extension). It looks quite good, especially on a black headband and is very easily reversible.
If I end up with an Audeze headphone soon (I'm trying!), I'm most likely going to try it.
My pair of LCD-3 have the Senn headband cushion and it works pretty well. Not as good as some other headphones I've tried it on, but it does relieve some of the discomfort on top of the head.