Just so you know, if my DM thinks an idea is cool, he pretty much ends up getting you what you need in some roundabout way. This is how his world in first edition ended up having a race of intelligent chickens.
I've been thinking...
There was never stated limit on times you can use Haunt Shift on a single undead (while manifesting, they are a viable target.)
There is a rule against Haunt Shifting into a creature/magical item, but it should be legal if the item/location are enchanted later on.
Also, I just got a copy of Frostburn, Sandstorm, and Complete Scoundrel.
So my new plan is:
1. Become a Spellstitched Necropolitan, with Haunt Shift, Black Sand, and possibly Plane Shift as his spell-likes.
2. Find a lot of sand. Black Sand it.
3. Haunt Shift into the area of the Black Sand. Only use the manifest option, not the poltergeist option.
4. Manifest, Haunt Shift into an amulet. Do this a couple times. AFAIK, all of the objects would have to be destroyed to kill you, you would be able to manifest near any of them, and you would hear/see 60' around each one.
5. Disperse to the 7 winds, creating another amulet/whatever each time I manifest. If I have Plane Shift, I will cart 1 of the plane I detail in the 1st post, for the purpose of manifesting and gaining Evolved Undead template levels.
6. Sell off those amulets. Either that, or start a cult based off my omnipresence.
7. If I start that cult, I will eventually get a wizard/druid capable of casting Awaken Sand under my influence. Get him to cast it on the area of Black Sand.
8. Maybe Haunt Shift into a plane...
Please note:If I can't HS multiple things, this makes me sad. Otherwise, it would be awesome, especially since I would only use this nigh-godlike power to be the party sentry/face, because I really like those roles. Maybe some buffing on the sides...
I've gone a little over the top, haven't I?