I have had the same idea, i.e. chopping up the behemoth and forging 2 spiral bound books... BUT I am hesitant to do so because I am not sure how future me will react to past me chopping up a beautiful $75 book. Will I look back on the Chop as a horrible act of vandalism or a stroke of genius... My future reaction would probably hinge on how much I use the book. If I only use it once every week end until I buy the mini book, then it is probably pointless to chop up the big book... But if I game twice a week until the Mini book comes out it may be worth it to chop up the big book.
Oh woe is the gamer who desires a functional rule book at the table.