There is a way to do what you want but that requires downtime.
You could disable devices connected to the USB port of the AP from receiving power, thus solving your charging woes.
This can be done in the ap provisioning-profile
The command is "usb-power-mode disable". This would not allow the devices connected to the USB port to receive power.
Then push the provisioning profile to the ap-group.
Warning: In the future if you connect any USB modem , they will not work too.
Please refer page 219 and 221 of the AOS 8.5 cli reference guide for more information.
Not-so-innovative though, stealing power from the AP would only deteriorate their wifi. They are choosing power over wifi? What is the point of having a fully charged mobile phone with sloppy wifi. :D
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