Listen up, because this is important:
Libertarians ARE conservatives. An alliance to the Republicans by the libertarians won't come if the principles they believe in are not supported.
'Letting them climb on the bus and sit in the back' is not a way to promote alliance. You must serve them what they need, and that is a permanent adoption (really a rediscovery) of libertarian principles. Without that, they have no need of alliance (as what they want is not going to happen anyway), and you don't deserve alliance.
Reagan came from the Goldwater wing.. The libertarian wing of the Republican Party... So naturally, he had a lot in common with libertarians, and Reaganites still hold that commonality. But it is based upon principles and defending principles, not marriages of convenience.
Economic libertarianism is fine. Social libertarianism (rampant atheism, homosexual “marriage”, abortion, amnesty, just to name a few things I despise liberaltarians for) is Cultural Marxism. I, like the vast majority Conservatives, aren’t going to “moderate” our views, since we’re in the right. Abortion is wrong. Amnesty is wrong. Homosexual “marriage” is wrong. Two and two never make five, no matter what.