Bernthal is a must but he's only down to come back if his Frank isn't watered down and Disneyfied. If they're keeping Deadpool R-rated then they can do the same thing for Punisher, with the exception of him guest starring or making a cameo in a more kid-friendly hero's show/movie.
I also want Colleen Wing to be the official MCU Iron Fist and played by Jessica Henwick.
@DarthSkywalker will back me up on this. According to a recent interview, she turned down a chance to be in Shang-Chi (I'm assuming she'd have played his sister) to be in The Matrix Resurrections instead. I can't really blame her since it basically would have been more of the same that she did on Iron Fist but on a higher scale but essentially negate Colleen as a character. Since Colleen was the breakout character from that show, I think it'd be a great idea for her to be brought in to the MCU properly.
Danny Rand (or at least Loras Tyrell's Danny Rand) can go kick rocks, for all I care.