#2 Front row
We've seen it with numerous celebrities over the years and even with Bobby Roode. WWE could have Conor McGregor be sat in the front row of a live event or pay-per-view, showing him off to the crowd with many believing that he's just there as a spectator.
You could potentially leave it at that, or alternatively, you could make it the beginning of Conor's storyline entry into the world of professional wrestling.
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It would plant the seed for a major crossover between WWE and UFC, all the while building up the hype of an extended McGregor run in the company.
Social media would be buzzing about the prospect of having him stick around for a long time, but that sense of unknown is what would keep things interesting. It may not be what people were hoping for but at the end of the day, this situation would need to be handled very delicately.
Now for a much more fun choice.