I own the “Gamemasters Toolkit” and “Winter of Atom” via DriveThruRPG, as well as owning “Winter of Atom” in the physical book form. I see that currently there is no content sharing between DriveThruRPG and Demiplane. Is this something that is coming in the future? I own quite a lot of Fallout and Marvel content via DriveThruRPG and it would be a shame to not have access to it.
In the mean-time, is there a way to create a custom Origin for a Fallout character so that I can manually use the Origins from the content I own elsewhere?
At the moment there’s no sync between what’s owned on DriveThruRPG and either Demiplane or Roll20 other than the conversions that are specifically for our digital tools. This is because the PDF available on DriveThruRPG and the digital tools available on Demiplane or Roll20 are fundamentally different products. However, we frequently have bundles available that will include access to both the PDF and the digital tools, if you already own the PDF this bundle will provide a discount.
As for your second question there is not currently a way to create a custom origin within the Fallout character builder. We plan to introduce homebrew content in the future however which will allow for the creation of things like custom origins.