no neutral fields, that's a terrible idea
However you figure out the seeds is fine. Letting #1 seed select HFA or bye is decent too, but then go forward from there as normal.
IF they go that route (whoever ends up #1 seed gets the choice of 1) I would like to see all 3 teams in the running for #1 seed (KC, BUF, CIN) come out and publicly agree to it before any games are played this weekend.