Sounds like you need a micro USB to Lightning adapter. Lucky for you they will be available. Of course that means you'll only charge one phone at a time. I'd rather take two cables myself. This already happens anyway, it's just that usually it's 2 or 3 Apple cables.
Micro USB is so uncommon and impractical, difficult to plug in, barely anything uses it. Most USB devices use other "standard" USB connectors. Don't get me started on this, USB connectors are such a bad joke.
You can't forget that the port on the bottom of the iPhone will do a lot more than just charge or provide USB communication. Already announced are HDMI and VGA adapters.
Of course that means you'll only charge one phone at a time. I'd rather take two cables myself. This already happens anyway, it's just that usually it's 2 or 3 Apple cables.
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