Have you seen the Stronic Zwei? That's Fun Factory's new Stronic designed specifically for anal. I don't think it's available in the US yet, but I'll bet Eden will have it at some point in the not too distant future.
Someone posted a discussion about it recently. You can see it on the Fun Factory website
As far as using the Eins anally, I would think the risk of "losing" a 9+ inch toy would be miniscule - but I could be wrong!