Then again, NCIS: Los Angeles crossed over with Hawaii Five-0 back in the early days of that series, which has since come to an end, so crossover with a Hawaii show isn’t inconceivable.
And now NCIS: LA is coming back!
Whether or not that has changed remains to be seen; spinoffs like LA and NOLA may have made more sense to spinoff from NCIS since they’re all set in the lower 48 of the United States, and the NCIS franchise is established enough that Hawaii could reasonably stand on its own even at launch, or even just feature a character or two somehow from one of the other shows.