I remember watching RotS the first time and being really disappointed that we didn’t hear or see Obi-Wan’s message warning Jedi away from Coruscant.
I was really happy that we finally saw it in Rebels.
I would love to see a montage of Jedi survivors watching the recording and going into hiding afterwards. Probably during the epilogue montage, after Padme’s Funeral/Vader stares at the Death Star, insert shots of Jedi in ships, hiding on battlefields, etc… either hearing the message or watching the holorecording.
I think it adds to the tragedy that in addition to those who died, we get survivors who have to go to ground and leave being a Jedi behind them forever.