Possible Garen Update

I am sure this has been thought of before, but as a Garen enthusiast I cannot help but fight for his place as a viable pick for Ranked and Tournament play. In the current meta, being tank heavy, I feel Garen would fit right in and excel if it weren't for his lack of cc abilities. He takes damage like a pro, can silence that pesky mage, shrug off slows, and assassinate would be escapee's. However, he needs to be able to contribute more in a team fight. I feel that there is no better ability for Garen in a team fight than Judgment. What if Judgment stacked a slow as Garen spins and hits enemies repeatedly? The more consecutive hits onto an enemy, the more stacks of slow are applied to that champion. The slow could even diminish over time as stacks are removed or time out. This maneuver would be high risk for Garen to jump into the fray and stay there to apply slow to multiple champions. I don't want Garen to become OP overnight and ruin his play style, but instead become more viable. To keep Judgment from becoming just that, the cooldown could be raised slightly or even a change in the damage output. These are just ideas of course and I would enjoy hearing from other players about their thoughts and other possible options.