1. What I am doing for Gail is love and devotion; and what I am doing for Christine is honor and affection.
2. What I am doing for Gail are love and devotion; and what I am doing for Christine are honor and affection.
I'm not sure I like the sentences at all. None of "love", "devotion", "honor", and "affection" are all abstract nouns. Thaey are not things one does for someone. It would be better as What I am doing for Gail is [a matter of love and devotion] [motivated by love and devotion] etc.
As they stand, I would use the singualr verb. The subject of the sentence is a noun clause. Noun clauses are almost always viewed as a singular subject.