I believe that God will do what He wants to do when He does it...not before. When the rapture occurs believers will be taken simply because they believed on Jesus as Savior...not because a person believed in either a pre, mid or post trib rapture. W are saved by Grace...not doctrine. I think we are to live for God and let Him do what He intends. He dictates...not us.
As for the Rapture itself, there is a lot of confusion about what it actually is. I've been researching it and it's pretty clear that when the Lord comes, he comes on the cloud(s) of heaven on a cloudy day. He appears on top of either Mount Zion or Mount of Olives. The Dead in Christ (which might not be all dead Christians) are resurrected and caught up to the mountain with the Lord. Then those of us who are alive and remaining from the tribulation (likely a small number) are gathered with them. I am about 95% sure nobody alive is going to be transformed.
1 Cor 15:51-53 does not appear to have anything to do with Christ's return but instead deals with the period after the millennium. This passage mentions nothing about Christ coming, nothing about clouds, and nothing about a gathering of believers. This passage most likely deals with the final resurrection prior to judgment as the context suggests.
1 Thes 4:13-17 does relate to the Second Coming. But it mentions nothing about any living person being changed. Christ does not discuss any living person being changed either in any of the Olivet Discourse passages. The "Clouds" mentioned here when translated from the Greek can mean also "cloudiness" which would agree with the descriptions in Joel and other places. The "AIR" used here is NOT atmosphere or air of the sky!! The Greek is "aer" which means breathe as in alive. So it is very likely that nobody is going to be gathered in the sky on clouds but rather on top of a mountain in cloudiness.