Akali main's Idea to make the champion healthier while keeping the unique mechanic.
My thoughts on what could be done with Akali, as a main of the champion. If Riot really does want to keep her as similar to live Akali as possible.
I personally think the best way to balance Akali while keeping her unique mechanic (true stealth) would be to make the duration it takes to get back into twilight shroud slightly longer. More specifically the minimum amount of time needed to make sure she can't avoid all tower shots when diving. Currently if you are diving with minions and time your Q and auto's in sync with the turret shots you wont take any damage. Riot needs to remove that possibility. If you attack someone under tower you will be shot once by the tower before you get back into stealth unless you get out of range of course; once she enters shroud again she will have her true stealth back.
If the turret gets enough time to hit her once, then players should have plenty of time to point and click on her. This should stop a majority of the complaining players have been doing. The best estimate I found for the current time it takes to re-enter shroud was .65 seconds. Turret attack speed is .83 if I am not mistaken, so if that .65 seconds was changed to around .85 seconds Akali would not be able to dive unpunished as easily. The exact numbers I am not sure about, but Riot should know what they are and be able to test this. In depth I mean the time it takes between the first point a tower starts shooting a minion to the point when it can switch aggro onto Akali. The tower should have just enough time to take a shot at her, but almost as soon as the shot is fired she gets to go back into shroud.
This way if she got a kill while diving she would still be able to get out from under turret alive. With this solution the mechanic is kept in the game, but toned down to be less oppressive. Akali's twilight shroud is where the majority of the power is in her kit. If her time to re-enter stealth is changed like this she would be in line for much needed buffs elsewhere.
TLDR: The time it takes Akali to get back into true stealth under tower should be lengthened to roughly the same as tower attack speed, so she gets hit once by towers every time she pokes in true stealth even when minions are under tower with her. There would need to be slight buffs somewhere else in the kit to compensate.