Watched the first two Crisis on Infinite Earths movie, they're pretty good. SPOILER Constantine returns as a homeless man, he's essentially a version of Pariah here. He's explicitly stated to be the Constantine from the DCAMU who got changed and punished for his actions after Apokolips War and the House of Mysteries. His design is different and follows the Tomorrowverse so I wanted to make a profile for him but since he's the same Constantine as the DCAMU, I don't know if that's necessary (he does state he's been alive for centuries watching countless Earths to die so there's at least that in terms of difference)
Btw, he also has a nice fight scene with John Stewart where he matches him blow for blow, at one point he creates a Shang Tsung like skull that easily shatters one of John's barriers and John is visibly worried and before that, John tries to trap him with a wall and John just touches it, creates a seal and the wall instantly breaks down