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All you would need to do is to modify the existing Lahman database, add your own data, and then have the game use the master.csv file from your customized database. It would be a time-consuming project, though.
You'd have to create a 'historical' league and have your modified database always filled with the necessary data. But I could imagine there being a lot of headaches over player index IDs, etc. That would be a LOT of work.
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