If you get OEM hardware, those Rifle billet fork clamps are useful to mount spots on your forks. I did that with both Jade and Deerslayer.
Storz Performance offered a 1pc accessory/windshield clamp for XR750/XR1200 Sportster models which used inverted forks. They're listed as 55mm ID; fit nicely on the Valkryie and some VTX models.
If I run across the package of them I have in my stash I'll get a pic or two along with a part number.