why dont you run LAN cable into the study room? I think LAN is cheaper, and you can run several, to living room, to study etc.
OpenNet > ONT > LAN > Router
1. OpenNet and ONT at your maindoor area (i suppose you will have some cabinet there)
2. Run LAN cable to your study room (if have existing phone lines, can convert to LAN).
3. If you want more rooms with LAN, you can run a loop back to the maindoor area and add a simple LAN switch if connecting more than connection to other rooms. Or all other room LAN terminate at study.
4. Attach your wifi router to your LAN port in study room.