The alignment restrictions are game-historic b.s.
It's kinda like the 1e Clerics being some oddball Beat- The- Snot- Out- Of- Things- But- No- Blood- PLEASE makes you closer to medieval Jesus-y something.
1e put the other 8 (+1) alignments into Dragon mag.
Official, and ordained by Gygax so
3.0e put the other 8 also into Dragon mag.
Also Officially official.
3.5e has the LE CG and CE "Paladins" official in the SRD. They even call them Paladins.
3.0e and 3.5e had the "F"-allen paladin the Blackguard in the PHB.
The most argued thread in the history of the WotC boards, was Pally CoC = stupid.
4e Paladins could be all 5 alignments (though naughty naughty, no playing evil).
The 5e Paladin can be any of the 9 usable alignments.
Get over it, kids.
Ain't asking anybody to get over themselves, that ain't happening ...
Re-fluffing any random one PrC can go something like this :
http://www.minmaxboards.com/index.php?topic=5448.msg78308#msg78308