Thanks, guys! Yeah, it's 100% a storytelling issue as far as the dynasty is concerned. I have enough party options to complete five unique ones without a wedding and the heir is going to max her career no problem even without happy "just married" moodlets. I'll miss the satisfaction points from completing Soul Mate, but I think I can squeak by without them, too.
It was just going to be a really satisfying, happy chapter, and now it looks as though it's going to be . . . kinda sad.
I appreciate the suggestions, and I'll definitely give them a shot, though from the looks of the official bug thread other people have tried similar things without success. Worth a shot, though, for sure!
I could cross my fingers and wait for the next patch, but I'm really getting close to the end now (knock on wood) and I'm too excited to stop playing. Plus, thanks to the bug, I have a fun new restaurant to run, now. :p