As far as I remember, the MC could have a child with Aerie and in the epilogue with Viconia. Even though they were intended to be separate endings, they could have been cleverly linked together. Instead of Abdel Adrian, you could have had two descendants of him, one representing the good (maybe Aerie's child joining the Harpers) and SH as Vicci's child raised by the evil (Sharrans) to continue the Bhaals story in the second generation or at least use it as a starting point.
There's a lot of possibilities. Although if we're accepting Abdel as canon then he romanced Jaheira. Who died. So... yeah there are problems when you try to reconcile the canon from various sources. Maybe it would be best for there to be no canon romance as it does limit the ways those characters can be used in the future. I did wonder if at some point Shadowheart was considered to be Aerie's kid (like very early in her development). But then Aerie herself is still young for an elf, younger than Astarion and Halsin, so maybe she could have joined the Harpers in some capacity and become Jaheira's student (Harpers are supposed to be anti-slavery and she's definitely anti-slavery so working together at times would make sense) just as Shadowheart is Viccy's. But it would be cool meeting characters who are descendants of classic characters.
