#3. Simply host The Peep Show as advertised
Over the years, Christian has become known for hosting episodes of The Peep Show ahead of some interesting matches. As mentioned, Christian's last major WWE appearance was whilst hosting his talk show back in 2018. It may not be as ground-breaking as some of the suggestions elsewhere on this list, but the segment would likely still be newsworthy.
It's the final episode of RAW ahead of Backlash, which means that WWE would probably want Randy Orton and Edge to be face to face in the ring one last time before they meet in "The Greatest Wrestling Match Ever" on Sunday night.
There needs to be some kind of tease so it could be that Christian is there to host The Peep show, talk to Edge and Orton ahead of their match - before then being assaulted by Orton.
This is the last bit of promotion WWE has for a match that they are claiming will be one of the best there ever will be so you would think something big needs to happen in the build-up. Christian is Edge's best friend so drafting him in could still be part of a bigger angle down the road.