Preserving German naval expertise after Versailles

How could Germany preserve its naval officer and chief petty officer corps after the Versailles limits?

Create training and shore posts and arrange merchant-navy exchanges that keep more personnel employed and at sea.

The proposal aims to keep officers and chief petty officers professionally active after the Versailles restrictions. Additional appointments and longer periods at training schools would give the small navy places to retain experienced personnel. An officer-sharing arrangement with the merchant navy could provide more sea time. These suggestions concern preserving skills for a future navy; the exchange does not establish how each arrangement would comply with the treaty.