So what I've done is come up with a rework of the Nanohive that makes more sense based on my personal views and some stuff that I've seen others discussing on the boards. Please note that the costs for the Nanohive is going to be a bit confusing/extensive, but I think it makes it a good deal better.
The spoiler part is what would appear in the book if it was being redone.
[ Spoiler ]
Now for a few explenations, I made the .5 essence a one time payment because of the flavor text in the original that seemed to indicate that it was ment as such. I also allowed this to increase the time of decay of all nanites, since this seemed to make a lot of sense given that the point of the organ modifications was to decrease overall wear on nanites period, not just the ones being cared for. I also dropped the essence cost of each rating because the .25/rating seemed very high compared to a flat 2 capacity for a cyberlimb. For .25 essence and 5,000 nuyen it was easy to get an obvious cyberfoot (which no one would ever see through shoes.) and be able to fit two Nanohives of any rating you wanted, thus being able to get 4 essence worth of cyberware at .25 essence and an extra 5,000 nuyen. This is also what prompted me to increase the capacity cost for any Nanohives beyond the first, that and a comment by some people mentioning that the hive is odd in the cyberlimb since it requires direct access to the meat and blood through which nanties move.
So, feel free to share your comments and ideas on what I have come up with. Hopefully this makes Nanohives a bit more practical without getting random cyberlimbs purely to get Nanohives without massive essence drain.