Could you not actually move, sell and buy, into the better catchment?
The system isn’t ‘unfair’. It is a fair system but doesn’t give all the people exactly what they want. Unfortunately your local comp will have become more and more ‘rough’ as more and more people have avoided it. Schools thrive for all on a mixed demography. My Dc have done extremely well in an outstanding comp where, yes, sometimes police were called, sometimes some pupils had knives and often the community police were outside, getting to know students, stopping anything escalating. ‘Rough’ schools can often have great teachers delivering a good education. Have you actually visited the school?
All said, I know there are schools I would refer my kids not to go to. So would genuinely move house.
The problem with renting is when you move back, place 2 more siblings in tne school even though you are now out of range, and meanwhile, every year, another ‘out of catchment’ family are moving j to the rental you just left, doing exactly the same thing. Bagsing their own future sibling places. And every time it happens they make places for the genuine locals harder to get.
Middle class engineering of the system. Just as unfair.
Really move. Contribute to your new local area, stop the exponential reduction of places for locals.