At the 12U level, do you feel it is necessary for both 3B and 1B to charge a bunt? If I have athletic, good fielding pitchers, can P, C and 3B cover all ground, which keeps my 1B at first?
How is the 1B ever going to get better if all that is practiced is a work around designed to minimize her weaknesses? Just saying, teach your players the right way to do things so they can develop and improve, and resort to work arounds and gimmicks as a last resort if you must.