I don't have a Microsoft pen to test it with, but adding SideloadedMode=true under ApplicationPreferences to your conf file might work, since it appears to disassociate your ereader from a kobo account.
As for running Sage/Elipsa firmware on the Libra 2 - The Sage and Elipsa run on a different hardware version than the Libra 2. This means that it's very, very unlikely that firmware for either will work on the Libra 2. I suspect that trying to add it will result in either a failed upgrade or a bricked ereader.
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