Since you are removing silences, let's come up with things to get rid of the rest.
- Ult silence is replaced with a .3 sec stun. When you think about lightning you kind of get the stun thought.
- Cho'Gath's W is now a fear. Since when he roars that would fear the opponent.
- His crows now slow and marks the enemy. If he Q's that enemy they are stunned instead. This helps fiddle with his "issue" with his W and the opponent running away.
- His Q now stuns for .5 secs. This allows him to start up his spam and makes him harder to run from.
- Now slows and lowers their Magic Resist.
- Reduces the enemies current mana by 50%, but it rises back up once they leave the field. This creates it so if they have like 150mana and they need 100mana for their ult. Their mana will be lowers to 75 not being able to use their ult.
(I don't think Soraka needs a change in her silence since it's one of the more healthier silences.)