Flexible Joint for a 200mm Dia Pipe

I am looking for a flexible joint for a 200mm dia pipe which will allow me about 100mm movement in any sideways direction, just before my pipes turn 90 deg into a roof space.

I am aware of the loop system with 2 flexible couplings will give me a lot of movement, but they take up a lot of vertical room and I only have about 1.5 meters in the pipe before the bend. My problem being the pipe is large and under 8 bar pressure.

Any advice appreciated.