How many lighting circuits serve the space? I believe that if three or more lighting circuits serve a space, the EM lights can be from any circuit. So if you have a large open space with multiple lighting circuits, you could just take power from any convenient circuit for the EM lights. This may depend of your local fire code.
You could consider installing a separate charging station for the batteries near the lighting fixtures, eliminating the need for extra wiring. Alternatively, if feasible, you might be able to reconfigure the existing wiring to accommodate the battery charging without major rewiring.
Not true. ART.700 up until 2017 circuit for EMG lights had to be same circuit as the lights for that area. 2020 2023 is less restrictive and can be from same panel.
Not true. I don't know when it changed, but 700.12(F) had an exception stating what I stated. Sure I might be outdated, but I didn't just make it up. And it may have required it to be a dedicated circuit. I don't know remember now.
I agree. Kinda hard not to notice that there's a battery pack in there.