My take is that it should be a prior player with major clout.
I know this often doesn't work out. But I think we are in the rare situation where it WOULD work out. You can't bring in a college guy nor an unproven guy nor someone that's just a sloppy seconds/thirds. Why? You have highly spotlighted hall of famers on the roster that, in a pinch, are bigger than the team if you're being honest. You're gonna need someone to bring them back to Earth and really center the moment. These prior(s) floating around are just gonna come in and try to capture the monent and it won't last.
Random mid year game? Why would these guys care? Hall of famer behind you telling you that these moments are fleeting or that you need to shut the hell up? What are you gonna do? Sully had balls for about 1.5 seasons here. We all remember it. But looking at that objectively he was nothing and a relatively unimportant NHLer.
So yeah, I think a former (stud) player - - I'll reserve that spot for when I can really pin one down lol - should be our next bench boss.