RE: Encroaching suburbia & the flying field
1 ... Go electric, ban jets and noisy engines.
2 ... Watch membership collapse.
It's a conundrum; you are discovering that, in a democratic system, you have NO property rights.
Meanwhile, I expect that you'll have to re-locate. Anything else will be just a "sticking plaster".
Who is to say that your 2.4 is safer than my 35? Let's be honest, any sort of radio failure is vanishingly rare ... has been for a couple of decades... it can nearly always be traced back to the operator.