" I want grammar school children educated with other clever children in the top set of a school where children who do not start off in that top set can aspire to be in it."
So you do want them, as role models. And you think this will do more to improve non selective education than.. improving non selective education?
"And where the 77% of children who are not able, for whatever reason, to jump through the grammar school hoop at the age of 10 have not been publicly declared to be failures."
They would not be, if non selective education was as good.
The least worst option is not really awfully good, is it? Is that the best you can do?