Danzig's ability to modernise a capital ship

Could the naval facilities at Danzig modernise the hypothetical Polish capital ship?

Capital-ship construction at Danzig suggests substantial modernisation capacity, although the precise ship and yard identification remains incomplete.

Facilities capable of building a Mackensen-class battlecruiser would probably have substantial capacity to modernise one. That inference depends on identifying where the unfinished ship was built. The location is identified as Danzig, although the particular yard remains uncertain. Construction capacity provides a reason to consider the conversion feasible, without establishing the facilities needed for a specified modernisation.