I get that. Double orarions are a little confusing to put on at first (you need to know which end is the front and which is the back), but crossing it is an easier deal. With single orarions, the biggest thing is not to put it on upside down or forget the pin, which some deacons have done. It probably would be a hassle to return the orarion back to normal deacon configuration after communion for the single orarion in the limited time between "Let our mouths be filled" after the priest does the censing, and when you have to be in place for the litany (right after the singing ends). And it doesn't look good if you walk and talk at the same time. Speaking about communion, for me. a deacon doing it is a little strange, because it is not something under his direct purview. In the Russian tradition, he usually comes out with the chalice and either holds the cloth for the priest during communion itself (more common) or holds the chalice while the priest handles the spoon. For a subdeacon, it will be even weirder, because he does not touch the holy gifts at any time (AFAIK, he only touches the altar to move the dikiri/trikiri set, and hand the spoon/spear/cloths from the Table of Oblation when it is empty). With a deacon, I would accept him doing it if there is no other priest available, and it is normal for his tradition, but it is not something that I would encourage.