Reputation and alignment [Houserule, 3.PF, E6 - HELP WANTED!]

[Altair_the_Vexed]

EDIT: added some suggestions, decided to grant an Intimidate bonus to Chaos as well...

I've had an idea to make alignment mechanically significant for my E6 PF game.
In E6 every bonus and penalty counts, even when they're small - so I thought that combined with a reputation mechanic, your alignment could colour the way NPCs perceive you.

Where I'm stuck - hence "HELP WANTED!" - is in deciding which social skills should be granted bonuses for which alignment axes.

I'm fairly sure that the neutral axes should grant no special bonus - just the flat diplomacy bonus for sharing an axis.
The other axes should grant bonuses of some sort - but what?
I was thinking good should boost diplomacy, evil boosts intimidate - but law and chaos are harder to decide on.

Please help!

Here's the rule as it stands:

Alignments
Your moral and ethical outlook makes a difference to your understanding of others.

It is easier to understand creatures and people who are similarly aligned to you.
You gain a +1 alignment bonus to Sense motive checks against targets with any shared alignment axis.

It is hard to understand people and creatures that are utterly opposed to your way of thinking.
You take a -1 alignment penalty to Sense motive checks against targets with an alignment on the opposed alignment axis.

The GM applies these bonuses secretly, without revealing the alignments of NPCs.

Reputation
Heroes become more well-known as they achieve memorable actions - this is reflected by an increasing reputation bonus.

Your reputation bonus is equal to 1/2 your level (rounding down, to a minimum of 0).

Additional reputation bonus rewards may be granted by the GM. Characters doing conspicuous deeds may gain increased reputation. Generally, such reputation bonuses should be no more than +1 / level.

The reputation bonus sets the level of fame for your character. If NPCs have heard of you, then you gain modifiers to certain charisma-based checks, depending on your alignment.

To determine whether any particular NPC has heard of a character with a reputation score, make a reputation check, DC15.

A reputation check is 1d20 + reputation score + NPC's INT modifier

A successful check means that your reputation modifier is applied to certain social checks.
The GM may substitute a Knowledge skill bonus for the Int modifier if he decides the character’s past activities apply to a particular field. For example, if the character were a cleric, Knowledge (religion) might be appropriate.

Reputation acts as a penalty to Disguise checks.

Applying reputation
Your reputation modifier is applied differently depending on your alignment.

All alignments gain their reputation score as a reputation bonus to Diplomacy checks with targets having the exact same alignment. Reputation bonuses stack.

Good alignments grant a reputation bonus to Diplomacy.
Evil alignments grant a reputation bonus to Intimidate.
Chaotic alignments grant a reputation bonus to Intimidate.
Lawful alignments grant a reputation bonus to Bluff.