Last week I met a Taiwan manufacturer for box type ceiling fan for the office ceiling. Mainly for low ceiling, but so far only used in offices where it is fitted to sit on the aluminum frames of the ceiling board. Not sure if can use on plaster ceiling, but they are exploring as this is big market. Current design is not very presentable for homes. If manage to get more details, will post here.

Meantime, will advise you not to fit ceiling fan for our low ceiling. Maybe baby fans would be safer.