From the German POV , it really doesn't matter what the RN does. As such they were not a factor in the German war calculus.
How do you add the two together? Action against RN would happen and not a factor in plans.....?The point your making is obvious but the fact is the first post war lesson discussed in Weimar republic - was how to prevent a transatlantic alliance, since that was instrumental in loosing WW-I for them. Further any german action had to assume breaking out into a European wide war....so action against RN would eventually happen and steps had to be taken in preparation. For example any invasion of France had to secure the "low lands" so the KM & LW could initate action against the UK from that launch off point.