I've tried to do it, but I don't have the patience to match up the skin textures.
I've given up because my heart isn't in it anymore (due to home life and other irl bs). Plus there are plenty of other people out there already converting characters, which to me now makes it pointless.
Shinteo has quite a few tutorials on the subject on his Youtube channel (from to wrap heads, create body morphs, matching skin textures, fitting clothing to Genesis 8 characters, and rigging): https://www.youtube.com/@Shinteo5/videos