I think you should be very concerned with Omari as much as Jordan. I think it will speak volumes to both Omari and even to Jordan if you show support and thanks to Omari. Just because Omari said he will come to St. John's doesn't mean we should discontinue support.
Making signs is a great idea, I don't know exactly the NCAA ruling on that is but it sounds like a great idea! I know the school can't put his name on the scoreboard or in print but I don't think they have control over what the student body does under their own power.