I really like the idea of the Palading being available only as a result of successfully playing a lawfully good character! That's a good way to remind players that tend to just see their characters as a collection of stats and abilities and only pick the parts of "being good" they like to remember what is is to be "good". Especially if the alignment is connected to some kind of gods, players not acting like their alignment would propose could lose some of the special abilities granted by these deities until they get back on the "right" path again.