A Plan to Fix the Primaries

I'd like to propose a plan. I'm tired of have 9 conservatives and 1 moderate run in the primary, only to have the conservatives split the vote and the moderate get cross-over independents / democratic party votes and take all the delegates in a winner take all election. We can't have a separate primary, it would cost too much. And it's a little too much to ask the 9 conservatives to "do their duty" and just step aside for one to run (and we also wouldn't get a say in such a process, it'd be another smoke filled back room deal).

So, let's get the people we think are true conservatives to make a pact, and publicize it. For the first three Caucus / Primaries, Conservatives will vote only for these people, in a sort of parallel primary. Then, no matter what else is going on, the winner of that group will continue while the others drop out. In addition, that candidate will stay until the convention. If they win the convention, fine. If not, they will be the conservative voice there. What do you think?

Also, this applies to liberal / progressive voters as well. I'm sure they're just as sick of not having a voice at the conventions. I'll take comments from anyone!

Addendum: For clarification, this was originally in reference to the U.S. Federal Presidential election, but can apply to other elections as well.