Given their poor condition from bad maintenance following Jutland, their cramped conditions for short sorties in the confined North Sea, and general obsolence, very few of the ships at Scapa would be valuable to any of the main naval powers, which explains why its likely they all would have been scrapped. Britain and the USA have no real need for any ex-German ships, because with the possible exception of the Badens their latest construction outclasses anything in the HSF. I suppose the US might have some slight interest in the Derflingers as a stopgap battlecruiser until the Lexingtons are on line, but I doubt it. Japan, on the otherhand would probably be very interested in the Derflingers, and perhaps even the Koenigs and Badens. Crew habitabiliy and endurance is less of a concern to he Japanese because of their doctine to fight a decisive battle near Japan and this would be a cheap way of creating a better balance against the USN. An issue with the Japanese and Americans is that they are already engaged in their own naval race, and any acquisitions by one might prompt a counter claim by the other. Both Italy and France would have use of the German ships because range is far less an issue in the Mediterranean. France's navy was so woefully obsolete that virtually any German dreadought BB or BC would be a useful addition. Itlay was not in as bad a shape, but they too would have had use of more German ships than anyone else.
Of Course, the factors leading to the Washington Treaty would probably still be at play, and once that was signed, most remaining ex-German ships would probably end up being scrapped anyway..