Kim is not from an alternate reality. He was just a duplicate, same timelime same reality
Non Sequitor, not Deadlock.
With infinite possible timestreams to fall into, do you think it's realistic (cough!) that he found his way back to the very same exact timestream he left considering the inprecision of his tech?
But a story about Kim discovering how this timestream (terminology used in the episode.) was slightly and minutely different form the one he called home would have been amusing.
These two episodes are book ends.
He Annoraxes the Universe because only he, the greatest hero in all the universes can save Janeway, but the little shit dies a couple month later because he's really a deluded wanker.
Why not give Daniel Byrd a chance?