This is the entire purpose of Ron Paul’s candidacy. In order for it to work, Rudy has to get the nomination. When that happens and Paul announces his third-party candidacy (with Chuck Hagel as his running mate) Paul will turn down the volume on the anti-war rhetoric (leaving it to Hagel) and turn up the volume on the pro-life rhetoric.
So far, everything seems to be going exactly according to plan.
Paul already said he won’t run as a 3rd party or independent candidate regardless who’s nominated, so your speculation is moot.