Hm.... I see that now. I haven't actually done this, just remembered seeing the adapters, but now you've got me curious too.
Looking at the tank on mine, it sure looks like it's got the same POL style fitting on the valve as the (older) portable tanks- so the same adapter should work. The only problem I see is there might not be enough clearance with the adapter between the regulator and the end of the metal guard on the tank.