Half Zipper Sleeping Bag in a Hennossey Hammock

Just purchased a Mountain Hardwear UltraLamina 0 sleeping bag. Figured out to late that is doesn't have a full zipper but two half zippers. Wondering is anybody else has a Bag that has half zippers. Thinking it might be difficult to get in while in the hammock.
Going to try it out but haven't had a chance to try it yet. I have a Hennessy Deluxe Asym zip so can allway get into it out side and climb in but will get the bag dirty. Curious if anybody else has a problem with this issue.

Thanks

I always have a small tyvek "rug" under my hammock just to keep my gear and feet clean. I have done what you thought of - climb into the bag, then into the hammock.
http://www.mcmannenscouting.org/Misc/PorchMode.jpg