Alistar rework suggestion

I have posted this thread in the spaninsh forum but i have decided to write it again in english so more people can talk about it. Recently i have seen a lot of alistar that makes really hard to farm without exposing yourself to a very bad trade. If you combine alistar combo with jinx or caitlyn traps this trade will be fatal. Thats the reason behind my thought of making w a skill you need to charge to use the full range. Anyway, i thought in other changes to make alistar stronger but not so annoying in the farming phase.

PASSIVE Rage the bull: When alistar gets hit by an enemy champion he starts storing rage for second to a 20 maximun rage. If he recieves further damage or he don´t hit enemy champions with his w, alistar charges more rage. Basic attack of alistar reduce cooldown of abilities based on actual rage and each ability get boosted, but consumes the actual rage.

Q Pulverize: The next basic attack or w have more range and knock up enemy units on an area. At more than 10 rage points the area is bigger. At 20 rage points, the range is also a little bigger (maybe like shield throw of poppy) and alistar dash to the enemy before knocking up.

W Headbutt: Alistar start charging a headbutt, incresing range by time charged (like vi but with the range of alistar actual w). Alistar stops at the first enemy champion hitted pushing him away (unless q is activated). At more than 10 rage points, alistar doesn´t stop if he hit a enemy and dash all the way. At 20 rage points, Alistar is unnstopable. stuns and snares don´t stop her w at midway.

E triumphant roar: Alistar heals in an area. At more than 10 rage points, heal is greater. At 20 rage points, the heal also gives attack speed.

R: Unbreakeable will: The cooldown of his abilities are reduced, alistar maintain 20 rage point during all the duration and don´t have to charge w to get the full range.