Just an FYI, I checked in at exactly 24 hours last week, for each flight to and from Orlando. Both times, I got around B28-35 range, so lots of people must be doing EBCI. (I had a handicapped DS with me, so I pre-board when he is with me, so I was not concerned about what # I got).
That said, paying $140 for EBCI would kill me a little, lol. Couldn't someone check in for you at 24 hours? I have done it from the parks, and from a resort hotel, or you could do it by phone. Or another friend of family member could do it from home.