Yes, I also thought the DA:I tapestry idea would be a good way to go. Provide a cannon default set of choices, but allow you to change a limited number of aspects of the history.
Not that there will be too many direct references, because this is not a direct story continuation. I suppose a direct BG3 follow on might have been the Second Sundering and resurrection of Bhaal, but that would likely mean the oblliteration of your original character, which doesn't seem quite what one might want!
I'm thinking that this will be more like the way Mask of the Betrayer referenced and used characters from the NWN2 main campaign, and that could certainly be tweaked the way DA:I chose to do it.
