The question would then be "who is the 6th team?"
Or would the five Big Ten teams not bother worrying about having to have an "auto-bid" into the NCAAs.
The Big Ten has in the past - and present - taken on "adjunct" members to get up to the 6th team; Notre Dame in men's hockey, and Johns Hopkins in lacrosse (yes, really, Big Ten member Johns Hopkins).
From a hockey and geographic standpoint, Duluth would make the most sense.
But...
The Big Ten prides itself on being a "scientific research association, that also has athletic teams". They make a big deal about all Big Ten schools being members of the "Association of American Universities". When Notre Dame was added for men's hockey, they were not members of the AAU, but were 'in process' to be added? They became an AAU school in 2023. (Johns Hopkins was obviously already there when they were added for lacrosse. And we can go through the details about Nebraska, if we must.)
And no offense to UM-Duluth, but I doubt they're anywhere close to being eligible to be in the AAU.
I can't really see who would be a good fit, from both a hockey and AAU-membership point of view. My guess is they would say 'we don't need no sticking 6th team". But that might make putting together schedules all the more difficult.