First time poster, so please forgive me if I've posted this in the wrong forum. And sorry about the length, but this isn't easy to explain...

I'm trying to book a honeymoon, and I'm running into an issue with booking vacation packages on Expedia (and other booking sites). Here's the problem:

We live in St. Louis, the wedding is in Charleston, SC, where her parents live. We want to book flight and hotel together from Charleston, SC, to Puerto Vallarta, stay at Grand Velas Riviera Nayarit, and then fly back to STL. For our dates, the package with hotel and flight is about $2000 less than booking the hotel by itself (which seems crazy). Expedia is telling me I can only book vacation packages when it's round trip to and from one city.

The ideas I've come up with so far to get around this are:
(1) book RT from Charleston, never get on the return flight to Charleston, and book a separate flight home to STL;

(2) book RT from a place that's cheap to fly to PV, such as Mexico City, never use the flights at all -- only the hotel -- and then book our flights entirely separately.
Believe it or not, #2 is actually cheaper than #1, but I'm a bit worried they might cancel our package if we miss the first flight? Normally I wouldn't be so concerned, but it would be terrible for that to happen on our honeymoon.

Ideas I've eliminated:

(A) doing the opposite of #1 and booking RT from STL and only using the flight home (about the same price as #1, but then have the concern about them cancelling the package when I miss the first flight)

(B) flying RT out of a hub city, such as Atlanta or Dallas, that we could cross both going and coming (because of the problems that would create with our checked baggage).

I have a travel agent looking into this for me, but it didn't sound promising. Can any of you seasoned travel vets think of something I'm missing here? Thank you very much for any help you can give us.