A non-Borg Threatened 24th Century would be interesting.
How about a 'Q Who' type episode with Kirk and crew - They meet up with Q who propells them into the Delta Quadrant to meet the Borg a la Picard style. But instead of getting a bloody nose and running like Picard, Kirk and crew kicks their collective asses, freeing them all, much to Q's dislike.
Fanwanky, I know.
Kirk couldn't even face a fellow Federation ship without crying mercy. He'd be begging Q for help against the Borg pretty quickly