Ok guys, I just talked to Michael Franke from Mips-Computer - they have an IX38 board with them and are currently developing custom coolers for the board.
He will send me a NB block as soon as they are finished, should be around January 3rd. I also told him to cut the distancers for the PWM block short by 0,3-0,5mm so as to achieve a better cooling effect.
He said they'll look into it - and they are shipping to almost anywhere on the planet including, of course, the U.S. and Australia.