The device would be simple enough to build. I would expect that drivers might be needed but that all depends if m$ plan to add similar official devices at some point.
If they do then drivers will be in there somewhere, otherwise its gonna be a hard slog.
I suspect that if drivers are in there they would probably be slightly non standard so it prevents 'home' solutions using cheap PC parts which would stop m$ making a fortune on overpriced add on hardware.