Exactly what I was looking for, thank you!
If I understood the article on the minor orders correctly, a person is ordained to all the four minor orders (Doorkeeper, Reader, Exorcist, and Tape-bearer) at once, whereupon you become an Acolyte (Arpanyag) or Clerk (Tubeer). This is similar to the current Byzantine practice of combining the orders of Reader and Tape-bearer, although Exorcist and Doorkeeper are separate (unused) orders in Byzantine usage.
There is also a similarity with the Coptic tradition in that a Tubeer may perform certain duties of the Deacon, such as reading the Gospel, in his absence. In the Byzantine Church, these duties of the Deacon would be performed by a Priest.
As for vestments, both Deacons and Subdeacons wear the orarion. "In the Byzantine Church subdeacons arrange their stoles very differently than that of full deacons. In the Armenian Church there is very little (if any) difference in the vestments of a subdeacon and a full deacon." This is because the Armenian Church, like the Latin, but unlike the other Eastern Churches, views the Subdeaconate as one of the major orders of the clergy, although his responsibilities are pretty much the same as those of Byzantine subdeacons (except that he may read the Holy Gospel).