When I trail brake, braking doesn't even begin until AFTER turn-in.
That's about all I have to say about that.
The track corners that I'm aware of, it would be hazardous to even think about that.
It's hard enough doing it my way, and I think that at my stage of development it would be impossible.
In the specific Summit Turn 5 manoeuvre I mentioned, it would be patently impossible to slow from 110 to 45 if you're already turning.
We'll have to get together at Summit or VIR sometime and compare notes.