Unlike Norwich where you can actually commute between the two, thereby making it viable to have people do both, this suggestion would require sufficient radar staff to remain at Waddington for the entire shift - making them unavailable for tower. (It aint a short hop down the road).
The number you'd have to employ on this basis (due to Scratcoh) would make it totally impossible to finance or indeed staff!
As one door closes - another slams in your face