Just preorder and play when it's finished. Whatever Deity out there knows how many alpha/kickstarters I have by now. It's so many (and more are yet to come) that I have to simply forget about them until I get an email about the completion of said game.
And the upside is I get to support GOOD games and at the same time save a crapton of money. Win-win-win situation for me, my wallet and the devs. All it costs me instead is a tad of patience.