What is the advice/guidance you give to stakeholders with respect to the spread coming from the different downscaling methods (e.g. uncertainty across RCM's)?

I think that the answer depends on the stakeholder applications and a co-construcion process is needed to answer. The understanding of the specific need is required. Note however that all RCM simulations provided by C3S have been evaluated and quality-checked and are considered as plausible future pathways. Model selection within the large Euro-CORDEX ensemble then depends on the user needs and capacity to handle large amount of data.