If you need a cheap back up horizon that will always work, this is what you do: Hang something heavy, like a bolt, on a string from the ceiling. In normal flight it will be straight down. If you are upside down it will be laying on the ceiling...and if you're IFR, carry a duck and a cat. Since cats always land on their feet, they always know which way is up. So, just always manuever the airplane so that the cat isn't leaning. Ducks fly IFR with no problem, so when you get airborne, toss the duck out of the window and just follow it. (Just be on amphibs or get a land loving duck)
I'm sure Red Green down at the Possum Lodge would do it just like that too.