X10+v2 and an FrSky SBUS Receiver

[XPS]

You are correct that the frame rate that SBUS uses is too fast for analog servos. The X16 and X24 both have an option to reduce the frame rate internally on a per servo basis. So you can use the S148 at 1/2 the frame rate while the other servos operate at the normal frame rate. The new V3 X10+ will also have this feature.