It would also be possible to take something like a Budd Mount and just put standoffs on it, or you could probably get Merle Hyde to make you a custom mount with standoffs.
I forgot to mention that a nose ring is essential for the Budd Mount, but can be optional with Matt's mount, or even with a Hyde mount if you specify that requirement when you talk to Merle. For a nose ring to work, you need to get around the Hall sensor. Bob Moulder made his own nose ring.