FL has a closed to party primary. Democrats vote for democrats, and Repubs for Repubs... no open primary. Not allowing the opposition, in either case to decide a candidate, the media notwithstanding. Much more sensible than the stupid SC “primary” and other states. People switch parties because of this and it is a truer measure of the “bleed over” vote... as it clearly showed with the Reagan democrats in FL at the time.
Your entire premise is based upon some unproven theory that people are voting Trump insincerely. Yet, there are polls showing he has about 20 percent support with democrat voters...and he is clearly the choice of independent conservatives. So, you are saying heck with the possibility to expand the conservative base of the Republican party so that your guy might have a better chance of winning...which is about zero in any event? Or, are you one of those fine people interested in stealing the nomination from the people at the convention?