PKU,

So you have moved away from .... displacement is normally available and can be obtained from platform OIC.

In thirty odd years I've also dealt with a large number of North Sea flowlines. I could quote many occasions where a 'nearby' field has entirely different well characteristics to a neighbour.

A constant hanger will most definitely NOT "solve the problem" if the flowline or a connector is over-strained by poor design. You are not in a position to make decisions about fundamental design criteria such as wellhead growth. It is a specialised area for experts.