Looks like it would work. All you need is a character able to cast an 8th level evil cleric spell. There are a lot of problems being a standard vamp, so it might not be as good a deal as you might think (can't enter a dungeon without permission from someone with authority to do so, etc.)
from the srd:
Vampire Weaknesses
Vampires cannot tolerate the strong odor of garlic and will not enter an area laced with it. Similarly, they recoil from a mirror or a strongly presented, holy symbol. These things don’t harm the vampire-they merely keep it at bay.
Vampires are also unable to cross running water, although they can be carried over it while resting in their coffins or aboard a ship. They are utterly unable to enter a home or other building unless invited in by someone with the authority to do so. They may freely enter public places, since these are by definition open to all.
Slaying a Vampire
Simply reducing a vampire’s hit points to 0 or below incapacitates but doesn’t destroy it. However, certain attacks can slay vampires.
Exposing any vampire to direct sunlight disorients it: It can take only partial actions and is destroyed utterly on the next round if it cannot escape. Similarly, immersing a vampire in running water robs it of one-third of its hit points each round until it is destroyed at the end of the third round.
Driving a wooden stake through a vampire’s heart instantly slays the monster. However, it returns to life if the stake is removed, unless the body is destroyed. A popular tactic is to cut off the creature’s head and fill its mouth with holy wafers (or their equivalent).
from the srd:
Create Greater Undead
Necromancy [Evil]
Level: Clr 8, Death 8
Components: V, S, M
Casting Time: 1 hour
Range: Close (25 ft. + 5 ft./2 levels)
Target: One corpse
Duration: Instantaneous
Saving Throw: None
Spell Resistance: No
As create undead, except that this spell allows the character to create more powerful and intelligent sorts of undead. The type of undead created is based on the character's level. The following types of undead can be created by casters of the specified levels:
Cleric Level Undead Created
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15 or lower Mummy
16–17 Spectre
18–19 Vampire
20 Ghost*
*Ghosts created by this spell have three ghostly powers in addition to manifestation: malevolence, horrific appearance, and corrupting gaze.
The character may attempt to command the undead as it forms with a turning check.
Certain types of undead, such as liches, cannot be created by this spell. Such undead are created in other, very specific ways.
Create Undead
Necromancy [Evil]
Level: Clr 6, Death 6, Evil 6
Components: V, S, M
Casting Time: 1 hour
Range: Close (25 ft. + 5 ft./2 levels)
Target: One corpse
Duration: Instantaneous
Saving Throw: None
Spell Resistance: No
A much more potent spell than animate dead, this evil spell allows the character to create more powerful sorts of undead: ghasts, ghouls, shadow, wights, and wraiths. The following types of undead can be created by casters of the specified levels:
Cleric Level Undead Created
------------ --------------
11 or lower Ghoul
12–13 Shadow
14–15 Ghast
16–19 Wight
20 Wraith
The character may create less powerful undead than the character's level would indicate if the character choses. For example, at 16th level the character could decide to create a ghoul or shadow instead of a wight. Doing this may be a good idea, because created undead are not automatically under the control of their animator. The character may attempt to command the undead as it forms.
This spell must be cast at night.
Material Components: The spell must be cast on a dead body, and the DM may assign specific requirements for various types of undead. The character must place a black onyx gem worth at least 50 gp per HD of the undead to be created into the mouth or eye socket of each corpse. The magic of the spell turns these gems into worthless shells.
I would in game make the following happen however. You could never come back as a normal human again. You gave up your body to the darkness so guess where your soul goes? Now if you are CE to begin with that may not be a problem but like I said NOTHING (not even a diety) could bring you back after the transformation. But I don't see anything that rules against it other than the material components, the fact that it must be done at night, and to have a corpse
