I suffer under Lawful alignments. Extreme cases excepted (F/SN Archer in crossover RP's), I keep to restrictions terribly. Chaotic, or Evil. I do them better. Damn Paladins, having nice features but hard to enjoy.
*Tempts you with Paladins of Freedom*
I remember you said doing so would be "un-samurai-ish", but I think there is plenty of variation within the ranks to allow for it. Sure, most samurai may be lawful-something, but then you have your Son Gokus (ok, not a samurai, work with me here) who don't quite fit in but whose build (monks in this case) are usually lawful-something.
I'll put it this way. There is an (unannounced) NPC in this game you may meet up with from Jingu. He's a samurai in a fairly high position of authority, but he is non-lawful. That's all I can reveal about him though.