I have one of the Bintel large binocular mounts.
It has an AZ3 mount as it's base. The actual AltAz part of the mount is removed.
It should be a fairly simple project to make up a parallelgram mount to suit the AZ3 (or EQ3)
I've just looked at the (Celestron) Super Polaris mount I have and you can set it to 0 degrees, not sure how practical it would be. The Vixen GP mount which is very similar doesn't appear to allow the same 0 degree setting but I didn't try real hard..
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