Most D-III selection committees use the criteria to select teams to fit the field. I would submit (as other do), that D-III hockey uses the criteria to exclude
teams from the tournament. There are only 3 at large spots to fill and a lot of deserving teams that can lay claim to one of those 3 slots. Is it easier to exclude than to include?
So, in a totally symmetric world, we'd have a 16 team field. Who would be those 8 teams and then seed the tournament according to the 500 mile rule.
Weekend 1 would be Friday/Saturday at the 4 national seeds (4 teams @ each site). Weekend 2 would be the semis and finals.
Go for it -- and enjoy your summer.