A new name will be needed for this single pot contribution. The definition of ante everywhere you look is an equal amount put in the pot by all players. A consolidated ante is an oxymoron. It is a different animal and causes strategy changes in the game. A button "ante" changes it the least and has the least impact on any one player or position. No one complains about when there is no small blind. Choosing the big blind to "ante" is simply a way to force short stacks to be at risk sooner.
Perhaps a consolidated "ante" is a short lived transition. Antes were the primary user of 25 value chips. With consolidated "ante" only the first couple of blind levels use them. Save time? Why do we need 25 value chips at all - messy to count, messy to play with, messy to make change, and have to be bought up after a couple levels. Start with a couple more thousand in chips, start blinds at 100-200 instead of 50-100, (25-50?), and get rid of any kind of ante entirely and let the blinds drive the tournament. Cleaner, more efficient, faster, less confusing.