I'm not sure it would help disadvantaged pupils though.
On average, disadvantaged pupils tend to get lower results and I think that actually having the results might well be harder to choose the pupil who has got lower results, even if they know they're disadvantaged.
They're also disproportionally likely to be trying to work to get money over the summer, so have less time to spend on applications.
When dm applied it was common to apply in 3rd year 6th, I wonder whether a year of (compulsory) community/national service where you would apply would work?
I don't think you can fairly even out discrepancies. How do you compare between the pupil who has 5 A* at A-levels with full private education and supportive parents and ABB for the child (like my dad) whose parents really thought education after 16 yo was a waste of time, and they are having to work 3 jobs a week to pay for bus fares and things they need for college?
You could look at it that the ABB has much more potential. But you can't actually tell that. And the child whose got 5x A* may have had every advantage, but may still have more potential.
Then you get the child who goes to a state school, but whose parents have paid for tutoring the whole way up; or the private school applicant whose grandparents have actually paid for the education and parents who think it's a waste of time and been constantly awkward about anything academic and actually the private school is pretty rubbish...
Although I think there is an unfair disadvantage, that if anything is going to get worse, I'm not sure it can be solved so easily.