Sorry, no. There are a lot of Constitutional conservatives that oppose Trump, and trying to portray everyone that opposes Trump as "establishment" simply removes any meaning from the term.
You are by definition GOPe because Cruz can’t possibly win sufficient delegates to be the nominee. He’s in it only to do the GOPe’s bidding by trying to prevent Trump from getting a majority. Cruz and his supporters have thereby joined the establishment against the rest of us trying to end the Bush created stranglehold of Country Club northeast liberals and crony capitalists over the Republican party.