You are giving us an interesting option in the way of vampire form for those of us who like playing around with battlemages next mod. I think you should throw those of us who would like to make a battlemage a bone.
Drop Greater necro focus back to palemaster III. Reasons:
1. It will still be necessary for those who are pure caster only pale masters so its still taking a feat.
2. It ties in with the most powerful form - liches who are obviously masters of necromancy rather than vampires and wraiths who are lesser undead some not noted ofr their casting ability
3. Makes battlemage forms more interesting without a cumbersome 2 feat penalty. One i get am and fine with but 2 just seems a little rough, Think 12 wizzy/6x/2x - not a master of necromancy but certainly proficient. With these deep splash builds 2 feats is rough whilst 1 is only half as bad.
Cheers
N