Being an undead is either a very bad idea or a mildly bad one, depending on if the DM lets you abuse the free stats.
Incarnate might be doable. It can get Meldshaper level*8 to HP and is a d6 class to begin with. In addition to easy miss chances.
Other ways to help IP
ACFs
Fighter
Resolute(CC)-As an immediate action gain 1/2BAB to will saves. Replaces even level bonus feat
Monk
Invisible Fist(Ex. E) Turn invisible as an Immediate action 1/3 rounds instead of evasion. Lasts 1 round. Instead of Improved Evasion you can use Blink 1/3 rounds as an immediate action. Lasts Wisdom mod rounds.
Feign Death(Ex. E)- You pretend to drop dead so well you become immune to death, paralysis, mind affecting, stat drain, stunning, negative levels and poison. Replaces Evasion. Rangers, and Rogues can take this to, but its not as funny.
Sorcerer
Divine Champion Gain a bonus equal to caster level on saves and AC as a swift action for caster level rounds. Hemmorages spell levels.
Feats-Not as good as spells, but would you rather the gimp do one of these or take Weapon Focus?
Fell Conspiracy(Ex. E) Nobody in party is flat footed or flanked unless you all are
Blessing of the Godless (Ex. E) Reserve HP equal to party level*number of party members that can be drawn upon as an immediate action. Takes 6 minutes to perform, and should help when a monster that does 70% of your hp as average damage gets a crit or rolls high. Later +4 Morale bonus on saves vs Divine spells
Bind Vestige- Choice of immunity to falling and seeing in the dark. Kind of sucks.
Improved Bind Vestige- Choice of immunity to transformations, or wisdom damage/drain. Is 22 AC good enough for level 1-2? Thats an option if it is.
Practiced Binder-Choice of See Invisibility, infinite scouts, and breathing underwater.
Shape Soulmeld- Protection From X immunities, Bull Rush, a weak miss chance(15-20% at level 1), Dimension Door, and/or resistance to divination.
Apostate(EE)- 1/2 level on saves vs divine spells
Insane Defiance(EE)-Redirect mind affecting effects
Deformity (madness)(EE) Immune to mind affecting effects, 1/minute gain bonus equal to 1/2 level on will save