The right pinkie's job is much easier than the left pinkie's; it just helps balance the bow and doesn't have to do any hard work. I wonder if this nice curve is more an esthetic than a functional concern. I'd be tempted to play with the finger you have rather than the one you wish you had.
Another option would be to try the Russian bow hold where the pinkie does nothing (if I remember that correctly).
You can also buy these commercially but I haven't had as much luck with those ones working -- the size is usually wrong and they tend to be too rigid.
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