As of now Basso is 4.00 for another 4 days i believe. So if you were quick you have 1.64 points on top of any or your riders average riders average to bring you to 39.00 that you can go to. For a one rider change because i'd do that if i had the time as your second rider wont be much better than what you have.
So for Ully on 6.62 you could fit a rider on 8.06, as a single change. Hans 6.64 ......... 8.04, and Scotty 6.23 ...... 7.87 .. The best of the 2 riders i was told finished his last British season on a knats cock over Scott + the 1.64. So if my maths and info are correct, and your quick, you could have 1 decent change Once Bens first GSA comes into effect it will need 2 to get riders out to fit him in.