I have no experience with indie development, so I don't know that anyone has paid for all the expertise in game design rather than acquiring it themselves. However, this strikes me as a bad idea because it is important to know how to do every task in developing a game as a project manager/producer so that you can manage them. If you have no idea how to do a job, how do you know how long it should take or how to help someone who has hit an obstacle or have the ability to interview in order to find good employees?

Plus, great game design ideas are common. We literally have over 30 design docs of games we'd like to make some-day because the ideas are cool, but when each team can only create a single game about every 3 years and you have successful IPs that can make hundreds of millions of dollars with sequels, they cannot all be made. We have a mush-pile of hundreds of great pitches too with neat game mechanic hooks that never made it to the design doc phase, but that are basically all cool game ideas. The difficult and magical part is bringing the game to life and making that great idea fun.

You could hire an indie to put together a design document to flesh out your game idea and then hire an artist to make some concept art and create a video that talks about what the game will be for a Kickstarter. You'll want the game producer to have some note-worthy credits behind him/her so that you know that they can do the job and to help with crowd-funding, and you'll need to give the key's completely to the game producer after you set things in motion because you'll need the Captain of your ship to have experience making games before. Good luck.