You can run pritty much what you like in the Senior Honda run Aran Slights WSB bike for joey once. Last year senior Dave Johnson was running in 8th before he slipped of. And the Aprilia motors aren't WSB they are factory motors tuned by Norton and don't forget you can run BSB speck bikes in the super bike race they are far from super stock.
Norton a small team on a small budget and as with most things peaple just love to knock them instead of saying you no what there working hard and doing bloody well.