I would test out some eneloops during rehearsals and especially in your intercoms. keep track of how much runtime you are getting out of cells. Just to make sure they will make it through a performance without any possibility of failure (plenty of overhead).
I'm not sure how many cells go in those Shure mics..... I'm going to assume 2 per transmitter. I'm not sure how many shows you have in a day. Assuming 2 shows 3 nights a week? That would account for A lot of cells being tossed....
My personal method would be to plan on swapping the cells of every mic and intercom between every show and rehearsal. This way you would never be very worried about a cell you tried to get through an extra show with going dead on ya, and no guilt of waste either
If I'm doing the math right, adding those intercoms into the equation, you need to have about 300 cells on hand. And the ability to charge as many as about 150 at a time. Does this sound right?
As far as the logistics of the battery level indicator, the test run during rehearsals might give some indication of what can be the expected behavior of the state of power indicator there. The way I see it, by always knowing that a freshly charged set of cells is going into every mic before every show, there wouldn't be any substantial need to even watch the battery indicator, one less thing to worry about during the show anyways, so might be well worth the investment.
Don't worry about the MAHA 808, nice charger, but it's going to take up too much space on the rack and cost too much to be worthwhile. If figure you need to be able to charge up to ~150 cells in a day. A large charging station will need to be set up with ~150 available charging bays... You could probably work out a deal on 20 MAHA 800S chargers for about $1000.. Which is probably overkill. But would definitely pay for itself... Are your "runs" back to back pretty much all year long or do they come and go? this may be the difference between whether a cheap charger investment or fancy charger investment should be considered. A rack of 20 800S chargers could be loaded up with yesterdays used cells when you come into work that night, and be done and ready to go part-way through the shift, which may be overkill...
In an effort to reduce initial costs, I would have to imagine that you could get by on a set of like 15-16 10 bay "cheap" chargers, like these:
http://www.all-battery.com/index.asp?PageAction=VIEWPROD&ProdID=518
With these you would have to make sure all the used cells are on the charging station before you leave at the end of the night, and they should all be topped up when you come in the next day. Total cost of 16 chargers (enough for 160 cells) would be ~$350..
So in theory, buying 300 eneloops should get you a bulk discount that's at least, sortof noteworthy, maybe $450-500? Plus a huge charging station, even if you build a charging station out of 800S, you're looking at ~$1500 total investment... based on my calculations, it would pay off in about 3 runs, sound around right to you?
Sorry if I can have way farther in depth than required here, I'm just thinking out loud about how I would deal with this situation...