Seems Les Baer has entered the race with a grendal type variant or possably the same round with a differant name. they have brass and dies avaliable.
Les Baer Custom Inc.
there also offering a 6mmx45 with brass and dies and ammo.
Id really like to build a 6mm grendal or simple 6x39 type set up on a standard AK. these are just more options. Ill add some info when I find it.