IOS accessibility: Turn page in iBooks with headphone buttons / bluetooth keyboard? I am trying to help someone with disabilities to turn pages in e.g. iBooks on the iPad. All I need for this is a single button, possibly one that iOS can interpret as an accessibility switch. 

I have looked at bluetooth switches that are made for this purpose, but it always seems like I have to purchase at least two devices (that amount to the equivalent of about USD 200) even in this simple use case. We're not aiming to control the whole OS, just to turn pages.

Is there no way to just use $10 earphone controls as a switch instead? Jailbreak or not.

Or can pages be turned in iBooks with a paired Bluetooth keyboard? That would be great.
I found out the hard way (went to a store) that you can use arrow keys on a Bluetooth keyboard to change pages in ePubs, but not in PDFs. At least in iBooks. 

The problem now is that it doesn't work in apps that can read Adobe copy protected ePubs.