Don't forget that a higher airspeed is required to avoid a stall when the bank-angle is increased.
Not so. Stall speed goes up when G increases, not bank angle.
Anyway, this question is like asking "When driving a mountain road, how do I avoid going over the edge?"
Answer: "Don't drive over the edge."
Question: "How do I avoid a spin / stall on the final turn?"
Answer: "Don't stall or spin on the final turn."
And how do you avoid stalling or spinning? Watch the airspeed. Let's not make this too complicated.
QDM