I saw those when they surfaced on the Grado Fan Club thread :)...was rather excited about them until I saw they were vented, not closed...still, you're right, Jim might like the look of them and rattle a pair out.
I wonder if he can make the vents...I think I actually could. They wouldn't be the same venting as the Bushmills ones. Am thinking more along the lines of trying tiny holes drilled at even intervals in the same place, behind the lip of the mushroom top. Could even be a way of adjusting bass (more holes vs less)...now you have me thinking wje :)