I have a question - is it possible just to redirect the shortcut to BI.exe (with or without the renaming of "\eb\data\world\maps\campaign\imperial_campaign" and "\eb\data\text\imperial_campaign_regions_and_settlement_names.txt") in the middle of ongoing campaign?

In other words is there a way how to switch to BI.exe which would be savegame compatible?

The reason is that I have a well developed campaign which I do not want to abandon, but I seriously miss naval invasions (however dumb these may be). I am not interested in other BI features (like shieldwall etc.) nor I have ALEX. Thank you in advance!