As someone who prefers the nine-point alignment system to the current one... this thread is the sort of request that I find almost literally incomprehensible.
Because there isn't anything to bring back, or that was taken away.
The big change WotC made wasn't changing the alignments, it was divorcing alignment from mechanics. And that means that every time you play, you can use whatever alignment system you prefer.
If you like the nine-point alignment system, just go ahead and say your character is chaotic good. Or lawful evil. Or whatever. Roleplay them that way, and the problem is taken care of.
WotC consolidating the categories was not, I think, an attempt to avoid having parties of varying alignments. I think they genuinely felt that some of the categories overlapped in a way that was hard to explain to new players, and consolidating things would still reflect the full spectrum while being easier to explain. And there is some logic there, even though I prefer the nine-point system and the greater granularity it provides.
But the thing to understand is that their ultimate goal was to make alignment entirely an element that assist roleplay, rather than a mechanical element that can be used to aid or punish a character. As such, the alignment system is just a guide on how to operate your character.
And as long as that is all it is, there is nothing stopping you from being chaotic good or lawful evil. Or true neutral, or unaligned. Or whatever alignment you yourself want to represent.
If your character aren't chaotic good these days, that's a choice you made, not a decision WotC made for you.