yeah you are right, that is not the standard eaton charger, or at least not the snout and pulley.
the sc6 drives fine without the belt. Obiviously you notice the difference and I would'nt drive one for long without the belt attached, because it would be really boring... but if your belt snaps or the like, you can keep going.
I've driven mine without the belt on, and it just felt like a normal six.
Also, whilst it is fine to put maximum power figures side by side, and the rules says a p plater can drive the sc6, it is not really that simple. the alloytech will have a peak power output higher up in the rev range. the danger with an in experienced driver driving a sc 6 is the amount of torque the engine has down low. all things being equal, it is no issue still but the do tend to catch you by surprise in the rain.
6psi should be no problem, but would be interested, to know the diametre of that pulley?
Also there is a reason they didnt bring our the sc6 with a manual box, so now that you have bought it( by the sounds) take it a bit easy on the transmission.