On handling/bearing the ring...
In my view all that you have listed were bearers except Gandalf. All of them had it for some time, if you count Sam, having had the ring after Shelob`s attack, and carrying Frodo up Mount Doom. But Gandalf only held the ring for a few seconds time. As for switching the chains, I believe it would have been Sam. Gandalf and Elrond avoided touching the ring, whereas Sam was not being bothered by its power, and did not wanting to take it away from Frodo. But who gave him the chain? Maybe Elrond. Hmmm... interesting thread.
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*.:A friend is someone who reaches for your hand and touches your heart:.*
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