What if the ammo indicator was expanded to show spell stacks?
A major part of what makes Annie so frustrating is that it's impossible to see how many stacks she has unless the stun is up. I know personally I abuse the fuck out of this by sitting at 3 stacks, then pressing E the moment before I want to throw a stun. Ryze on the other had has the issue of requiring you to click him and check his buff bar to know how many stacks he has, which just isn't feasible in chaotic situations.
How about just adding something like Jhin's ammo bar for these champions to represent their spell stacks? If this ends up being a nerf, then IMO compensation is more than worth the clarity it provides.