feather m0 bluetooth le + 3.7v lipo run 3.3v mcu keeb?

[DMacMakes]

Question/test request
Could this work:

1. Install your usb host samd library on a feather m0 bluetooth le
2. Connect 3.7v lipo to feather
3. Connect a keyboard by a 3.3v pro micro (with no leds/neopixels on the keeb) to the feather's micro usb via otg cable
4. Have the feather power this not thirsty keeb
   running its firmware on a 3.3v mcu (and no leds in use), capture its keycode outputs over HID and forward them over ble hid to a laptop or ipad?
5. Have the feather charge lipo as usual when connected to a usb port/charger instead of the keeb?