Just saw this thread, but I ended up designing my own the 3D printed adapter - been using it for about 9 months (in between all the clouds....) on my GSO/Bintel RC8 and ZWO EAF, the fit isn't perfect but its definitely close enough and I didn't feel like reprinting/redesigning it after I got something working.
https://www.thingiverse.com/thing:4568603