*tossing new wedding candidates into the ring that just randomly popped into my head*
Frankenwolf. I know we haven’t even seen them in a relationship, but we do know that the writers have a Frankenwolf pic stuck on their wall and this article hinted at Red coming back, and David Anders tweeted a little while back about having some news he couldn’t talk about that would make some people very happy, and people speculated if he was talking about Frankenwolf, (could have also been something completely unrelated, I’m just thinking that if they were scheduling Meghan to appear, those discussions might have happened a little while ago). Anyway, they could play it like they’ve been involved off screen for a while, and get Red back into the mix a bit for a few eps at the end of the season so her wedding wouldn’t be really random, (and Victor would be around too, so again with the scheduling a fair bit ahead of time if David would have to be in Vancouver for longer than he usually is), and it could be a bit of a, “Sorry we basically wrote Red out of the show but will you forgive us if we show her getting her happy ending,” kinda thing. Then if Meghan’s show ends up taking off, and she does get too busy to come back again in the future, at least they’ve given her character a proper sendoff.