Having preordered an Android based ereader that (unfortunately) doesn't have page turn buttons, I decided to do a few experiments on my phone first to see if I could fix this issue by having remote buttons instead, so it would still be possible to read in bed without getting the hands from under the blanket.
Solution - Powerpoint slide advancer (something like
this) + microusb/usb(f) adapter (
like this). Worked flawlessly with Moon+ (it maps them the same as the volume buttons), straight out of the box immediately after the connection, no additional software or rooting required.