You really are overthinking this. Don't lie, no one will care if you have two weddings. And if you use a courier, you aren't going to wait months before you go to the UK. Really this isn't as big of a deal as you are thinking right now.
Oh, and I had a friend that did the two weddings thing for almost the same reason. It was a major problem. The lies to had to keep piling on to keep the illusion were numerous and OTT. She really thought that she was protecting her family/friends in some way -- when no one cared. She was actually married for a couple of years before the second wedding even. And the marriage started to crack soon after the second marriage, she felt trapped that she couldn't separate from her husband because it was so soon after what everyone thought was the first marriage, and she thought people would think she was stupid. It has caused her countless problems when there really wasn't an issue to begin with. Seriously, it is 2009, no one cares.