Hi cyb4, my sympathy for your troubles, certainly not a fun time.
I did not get contrast dye with my MRI. I don’t know if this is due to different machines being used, or depends on what they’re looking for, so perhaps there’s a chance yours will be fine without it, too?
As for the cros hearing aid system, my experience is very limited and personal, but my ENT recommended this only after my WRS dropped to 28%. He said no regular hearing aid would help when it was that low. This is a good question, though, and I hope some of the experts on the forum are able to answer it for you better than I can.