In general, clutches and DMFs are changed at the same time - the additional work is minimal, it's mainly the additional cost of the parts.
No point in replacing a knackered clutch and leaving a part-worn DMF in place. When the DMF wears out, you've got to go through all the expense (or time, if doing it yourself) of separating the engine and gearbox, just like changing the clutch.
A DMF is there to absord torque shock from the engine, and to prevent that torque shock from reaching the gearbox. (Diesel engines create a lot of torque, which is why they're fuel-efficient and nice and 'lazy' to drive. Without the DMF, there will be a lot of stress placed on the gearbox, especially in first and second.
A replacement DMF is a lot cheaper than a gearbox rebuild.
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