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I got a great one for less than five bucks. I took and old bicycle water bottle cage, and using a couple of clamps from the hardward store clamped it to the rear crash bar.
I strapped a leather drink holder (similar to yours) over the door on the glove box in the lower fairing. So far the snaps have held but I have considered replacing the top snaps with bolts.
I've seen your sight, how about making some leather doors for the fairing, you could make removeable dring holders for them as well?
If you would ever like any type of accessory like you mentioned in your post,try to come up with a thin card board pattern and we will see what we can do for you.
Thanks the Captain