I have just tried this. Indeed it is tricky. If the tempo is very slow and bow changes are not allowed, it's nearly unplayable.
Before you try to play both notes, first check how fast your bow needs to be to make the harmonic sound right. Then practice playing on the G string with the same bow speed close to the bridge. You'll probably need a lot of bow weight for this. Once you can get the G to sound properly, add the harmonic as well. You should have a decent sound on both notes.
EDIT: The dynamic marking must be ignored.