Sorry to bust your bubble, but Tuesday night at the RNC - Romney, the Ruling Class and Boehner all took part and changed the rules DESPITE vocal opposition to ensure such a takeover from within by Conservatives WILL NEVER HAPPEN.
In short - the GOP-e and the Ruling Class, that same bunch that cooperates with Obama's Marxists and gives their treason a full pass - they made sure that their power is forever guaranteed to run and decide the course of the GOP. Their rules change ensures NO CONSERVATIVE GRASSROOTS MOVEMENT ala the TEA Party/Palin or Ron PaulNuts can threaten their control of the GOP.
Bachman, Akin, and Palin are just a few current examples of the GOP doing everything they can to ostracize them and leave them out in the wind. They would rather a Democrat take any seats they are running for than let a Conservative have them - make no mistake.
If Conservatives want a voice in Washington - they are going to HAVE to start a new party and let the GOP go the way of the Whigs. There is no other option. Anyone who tells you differently is either a damn liar, part of the GOP-e machine or clueless of where Conservatism actually stands on the political battlefield.
A lot of people, Freepers included, are unaware of the changes you outlined.
Rules can be changed.
Take over the precincts, take over the county, take over the District, take over the state...and next thing you know, you've got control of the RNC.
A conservative third party only means a Democrat majority...forever. Winning that way will require more patience than taking over the Republican party.