Constantine /Powerless

NBC is starting up Powerless shortly. Show about normal people in DC universe. They're supposed to be working at a company which is a subdivision of Wayne Enterprises. One of the characters is Van Wayne (think he's supposed to be Bruce's cousin or something).
Constantine was on NBC before it got cancelled. They producers of Arrow were able to make a deal so that Matt Ryan could reprise his role on Arrow/CW. So much interest was generated by the appearance/ratings boost, that now we're getting a web series with Matt once again reprising his role.
NBC hasn't said which universe Powerless occurs. There are superheroes, but we likely won't see too many of them, though Crimson Fox is supposed to appear.
Constantine has been able to cross dimensions (Ollie said he tried to contact Constantine once but Constantine was in Hell - literally).
Figure there are 5 possibilities for .
2) Constantine played by Matt RyaConstantine appearing on Powerless
1) Constantine won't appear/be referencedn appears. This would be cool.
3) Constantine played by Keaneu Reeves appears. Reference to the film. That would also be cool.
4) Constantine played by a different actor. See who they can get for the role
5) Ultimate fantasy/crossover. Matt Ryan, Keaneu Reeves and a third actor all appear as Constantine. 3 different Constantines appearing on one Earth.