Maybe a patron account?
already had a chat bout that with a few guys from the RC group.
one one possibility could be going to Steam Early Acces.
End of 2013 the Kickstarter for Bugbears Next Car Game/Wreckfest didnt do so well so they canceld it and moved to Steam Early Access (and sold the game directly on their Homepage).
Buyers got a Playground where physics and body deformation engine could be tested and a pretty early version of the game with 2 unfishied (but playable) tracks and derby arena.
They made 1 million $ in a week from Early Acces:http://venturebeat.com/2014/01/30/next- ... ly-access/
thing is they came to early access with something that people could play and a discount price for early birds.
Same thing Codemasters does with Dirt Rally (thou the game is very polished) and it seems like it going fine for em.
maybe this could be thing.
I dont think patreon would be a good platform, not because of the concept but because its more focused on video and music creators and help them have a substainable income so they can continue their work instead of getting a single big project funded.