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alternatehistory.com
It seem the theme has run out of steam, but I will try to reenter a proposal.
With reference to this AHC, https://www.alternatehistory.com/forum/threads/wank-the-rm-kriegsmarine-1929-pod.411490/ the task is to find out what the germans could have done. The POD is an advanced preparation for a Nazi take-over. It could be the original KM naval aviation Facility in Odessa that comes first, but in any case, the German comman and Lufthansa believes the Nazi's will take power at least in 1929 and from 1930 some increased Funding is available. Overt break of ToV is not possible before 1933 (where it is still an official secret). So maybe think mostly strategy, R&D, Infrastructure, training, but options are open.