My idea for the GOP establishment is to effectively seize the Libertarian Party (which has ballot access) via sheer mass of numbers, somehow; and install some sort of puppet candidate. (libertarians can't really complain, it's a free market - and besides they might get bumped up to major party status)
x-post from AAD:
Yeah, that's what I've been saying for a while that Trump could do. They're such doormats that they might be willing to give up their ballot line anyway (Bob Barr, lesa murkoki), but even if they aren't all you need to seize control is have a couple dozen people show up at a few meetings – that's what Pat Buchanan did with the Reform Party in 2000.
Trump of course can get more people to go to weirdo fringe third party meetings than the hardcore neocons/GOPe types can, so his campaign should act fast to seize control of as many third-party ballot lines as possible, as a preemptive strike.