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If you need an excuse for freikorps Germans, apart from the Baltics I think they also were present in the Ukraine after the Brest-Litovsk treaty. They 'may' have been fighting white nationalists, Makhno's Cossack anarchists, bolsheviks. From there it's a small step to the Back of Beyond. A small detachment may have ended up as mercenaries in the Caucasus, the Crimea and further.
Do any of you use the Pulp Figures late WW1 Germans as freikorps?
In terms of alternative history World War One - the "revolutionary sailors" would be perfectly good as Imperial German sailors with perhaps a couple of officer types to be added.I could imagine them defending the legation in Peking or some other exotic location. Or raiding some seaside village in England or France to kidnap a VIP.
I know this isn't perhaps the right board but you could always inject some pulp/mythos with German sailors during the war stumbling on a forgotten island/abandoned ship and investigating.
Perhaps Capt Sir Seamus Bond RN (James Bond's father) sets out to rescue Rosa Luxemburg from the Freikorps for Lloyd George to use her cunningly as a double-agent to undermine Lenin.......