I don't think any of these elaborate schemes will happen. Nothing is entirely fair or perfect. So I believe they will simply call the game a no contest, play the week 18 games. and the seeding will be what it is based on record with Bengals and bills with a 16 game schedule.
If all three hold serve, KC #1 seed, Bills #2 and Bengals #3. Could change if some win and some lose. Not perfect, but as good as anything else suggested and it has simplicity, which is a huge plus.