WWI Germany was not WWII/Nazi Germany. There won't be any sort of ethnic cleansing. while there will be some "German" migration to the Baltic States this would be more on the lines of entrepeneurs, businessmen, perhaps some professionals (doctors, lawyers) seeking more opportunity than in Germany. These will be constitutional monarchies on the line of the German system, with monarchs from the German nobility. Most likely the Baltic Germans will be most of the elite, and I expect that, like in Austria-Hungary, that German will be the language of most higher education, serious commerce etc and even if ones home language is Lithuanian/Latvian/Estonian, if you have any education you speak German well and all but the most ill educated have a basic facility in German.
Imperial Germany was not about obtaining large areas of "lebensraum". Actual territorial acquisitions (to be part of Germany) would have been some areas of France/Belgium for border security, likewise in Russian Poland. The Baltics and Ukraine would have been very tightly controlled satellites of Germany, not areas to be emptied of locals and filled with German colonists.
Any "Germanization" of the Baltics would be more along the lines of locals attracted to German culture and language as the way to get ahead, rather than a true ethnic replacement.
Imperial Germany was not about obtaining large areas of "lebensraum". Actual territorial acquisitions (to be part of Germany) would have been some areas of France/Belgium for border security, likewise in Russian Poland. The Baltics and Ukraine would have been very tightly controlled satellites of Germany, not areas to be emptied of locals and filled with German colonists.
Any "Germanization" of the Baltics would be more along the lines of locals attracted to German culture and language as the way to get ahead, rather than a true ethnic replacement.