Ken, TeamTec also will make the harness as a 7 point. The 7th point is NOT a sub strap, it is simply to keep the driver in the seat when upside down. It can be mounted anywhere (even forward slightly) as it is not used to stop the sub problem, only to keep you tethered to the floor.
As for the sternum strap, simply don't use it or remove it or have it made without it. They will do that. In fact, now that 2" shoulder belts are legal, get them. They will stay on the Hans better.
If you want to see one, I have one in my car and have since I started racing my own 944. I love it. It has pull up lap belts so I can get them much tighter than pull down ones. I also love the crotch (I am not married and still use my man parts
) and sternum pads as I hope they will dissipate the energy over a larger area and reduce bruising in the event of an incident.
Jim