I would agree but also disagree. Scoop only has this in 60cm (as far as I could see), so the presumption is made that you buy a bigger dish from Sat TV suppliers. The moment you do this you would most likely have to also look at modifying and positioning the "arm" that would hold the RB.
Using the arm from the Scoop dish would not work, as the radio would be too close and sort of off-center, throwing the focal point off completely (if you don't bend the arm, the beam direction would also be off). Using the arm from the bigger dish you may have to bend the arm inwards, thus moving the radio closer, then focal point blah,blah. Should you use the Sat TV dish as is, you would still have to play with arm length (to narrow the beam width), and most likely mount it sort of facing downward at an angle to obtain a horizontal signal path. Mounting it as such an angle would then immediately attract "unwanted" attention.