There is another option though. It will consider alot more work but it is there. You could pitch the idea to a publisher and see if they will pick it up. If they do you could get funding and then hire a small studio to create it for you.
Short of releasing the game independently be prepared for that baby of yours to be butchered. Publishers, Studios and the like tend to have their own ideas on what will sell and feel they should adapt that way. sometimes it goes over your head and it's this way or no more funding.
My sugestion is love the idea but be detached.