Firstly, re the snippet, then it works very - the only thing I'd say is to maybe get someone to Brit-pick it for you, since some of the turns of phrase are more American than English. But other than that it works very well - esp Amy's inquisitiveness.

But the thing that always justified the story in my mind, from the very beginning, was my discomfort with how easily the issue of Amy's crack-eaten parents got dealt with in the show.
Mmm, intriguing. Yes, I can see why that would fuel your muse!

I don't have any recs - I don't think, I might get back to you, and anyway, you seem to have a lot already - and I'm not quite sure how to help you with your delayed wedding dilemma. Unless maybe you can set the story a bit in the past so they're thinking about getting married, but haven't started planning yet? Not sure how you'd work that into the plot though.