My sister buys EBCI but never for everyone. If there are two of them, she'll get one EBCI and then do 24 hour check-in for the other person. If there are 3 traveling, she'll do 2 EBCI and one 24 hour check-in. Believe me, nobody wants that middle seat, and it's always, always been available for her party member. SHe has two DDs who are now 14 and 16 so no longer a big deal but she always did this when they were little and never had a problem. She's never been one to worry these things too much, and experience made it easier.
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This is exactly what I just did. My DH will get an aisle, My DD will get a window, and I'm taking a chance that no one will sit in the middle before my other DD boards. We will check-in right at 24 hours so I find it hard to believe that someone will really want that middle seat.