I don't know what the Book of Needs is.
Looking at the table of contents of the Mashdots I have at home, it has baptism and chrismation, services for engagement, marriage and second marriage, funeral and requiem services, various home blessings, healing services, "The Service of Hair Cutting of Adolescents," order of confession, and the blessing of the harvest.
There's nothing about a service for receiving EO's. As it is, most Armenian priests will just give communion to EO's without any kind of conversion. I think if an EO wanted to make a formal conversion, it would just be the chrismation service. I know an EO who made a formal conversion to the Armenian Church, and I think it was done by chrismation. I don't know if there was any specific modification done for his situation, like a special confession of faith or anything.