The first question you asked, I doubt it can be done they crammed the mic into the location with very if any room left and everything is integrated into that piece. You would also probably have to remove the housing the new mic is covered with, even than I do not think it is slender enough to be placed there.
As for the bump on the top, I think that is a sealed enclosure and can not be opened besides you would have to drill the holde bigger underneath for the end of the antenna wire to be ran there.
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