Hello - I am currently remodeling a bathroom with the intent to use a Kerdi drain. I have finished demo and have started on the drain. The house is ~47 years old and the drain is all cast iron. I am looking for some recommendations on how to proceed forward. The picture below shows the current state of the drain. I would like to cut the drain behind the p-trap and use a Fernco no-hub coupling to attach a new PVC p-trap and riser. Is this the correct solution for replacing the cast iron p-trap and riser?