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I know places sell plastic tubes you can put into golf bags to "convert" them but from what I can tell they end up twisted all the time. If you want a 14 way divider the best bet is to buy a 14 way divider (I really like them on cart bags but on a stand bag I'd rather have less weight which means something like the 4-way divider I have in my SM Three 5)
Those tubes are a pain in the ass as well, I think search the web, in fact I saw a golf bag by some European company that looked nice and kept everything separated very neatly. Someone needs to figure out a way to secure the clubs individually but is quick and easy to remove the club or put it away.