Well, its pretty logical since clip-ons are meant to be clipped on ears, I actually thought of that but it would be just too big for such small headphones (besides that, I dont like the look of heads as stands). But I have something different in mind right now, its basically the same as that acrylic/wooden AT stand, it would just be much smaller (half or even one third of its normal size would be sufficient), acrylic plate would be 2-3mm thick (instead of 1cm) and it would be placed horizontally (not vertically). That would be perfect, it would maintain the overall look of the rig and yet it wouldnt take much space. But as you said, I hardly can find something like that, so I might look for some handcrafter after all.
I must say I never heard of such a stand before and I'd be surprised if it exists.
One Idea might be if you know a woodworker that could sculpt a small wooden head with ears so you can clip them on to those? Silly, I know, but it's about the only thing I can come up with. :)